diff --git a/infra/README.recipes.md b/infra/README.recipes.md
index 20e5a6b..5a6ea74 100644
--- a/infra/README.recipes.md
+++ b/infra/README.recipes.md
@@ -95,13 +95,13 @@
 
 ### *recipes* / [gn](/infra/recipes/gn.py)
 
-[DEPS](/infra/recipes/gn.py#10): [macos\_sdk](#recipe_modules-macos_sdk), [target](#recipe_modules-target), [windows\_sdk](#recipe_modules-windows_sdk), [recipe\_engine/buildbucket][recipe_engine/recipe_modules/buildbucket], [recipe\_engine/cipd][recipe_engine/recipe_modules/cipd], [recipe\_engine/context][recipe_engine/recipe_modules/context], [recipe\_engine/file][recipe_engine/recipe_modules/file], [recipe\_engine/json][recipe_engine/recipe_modules/json], [recipe\_engine/path][recipe_engine/recipe_modules/path], [recipe\_engine/platform][recipe_engine/recipe_modules/platform], [recipe\_engine/properties][recipe_engine/recipe_modules/properties], [recipe\_engine/python][recipe_engine/recipe_modules/python], [recipe\_engine/raw\_io][recipe_engine/recipe_modules/raw_io], [recipe\_engine/step][recipe_engine/recipe_modules/step]
+[DEPS](/infra/recipes/gn.py#10): [macos\_sdk](#recipe_modules-macos_sdk), [target](#recipe_modules-target), [windows\_sdk](#recipe_modules-windows_sdk), [recipe\_engine/buildbucket][recipe_engine/recipe_modules/buildbucket], [recipe\_engine/cas][recipe_engine/recipe_modules/cas], [recipe\_engine/cipd][recipe_engine/recipe_modules/cipd], [recipe\_engine/context][recipe_engine/recipe_modules/context], [recipe\_engine/file][recipe_engine/recipe_modules/file], [recipe\_engine/json][recipe_engine/recipe_modules/json], [recipe\_engine/path][recipe_engine/recipe_modules/path], [recipe\_engine/platform][recipe_engine/recipe_modules/platform], [recipe\_engine/properties][recipe_engine/recipe_modules/properties], [recipe\_engine/python][recipe_engine/recipe_modules/python], [recipe\_engine/raw\_io][recipe_engine/recipe_modules/raw_io], [recipe\_engine/step][recipe_engine/recipe_modules/step]
 
 PYTHON_VERSION_COMPATIBILITY: PY3
 
 Recipe for building GN.
 
-&mdash; **def [RunSteps](/infra/recipes/gn.py#104)(api, repository):**
+&mdash; **def [RunSteps](/infra/recipes/gn.py#105)(api, repository):**
 ### *recipes* / [macos\_sdk:examples/full](/infra/recipe_modules/macos_sdk/examples/full.py)
 
 [DEPS](/infra/recipe_modules/macos_sdk/examples/full.py#7): [macos\_sdk](#recipe_modules-macos_sdk), [recipe\_engine/platform][recipe_engine/recipe_modules/platform], [recipe\_engine/properties][recipe_engine/recipe_modules/properties], [recipe\_engine/step][recipe_engine/recipe_modules/step]
@@ -125,6 +125,7 @@
 &mdash; **def [RunSteps](/infra/recipe_modules/windows_sdk/examples/full.py#15)(api):**
 
 [recipe_engine/recipe_modules/buildbucket]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/1b1ecd03e0b00399784c43add1465f685b6d1ab9/README.recipes.md#recipe_modules-buildbucket
+[recipe_engine/recipe_modules/cas]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/1b1ecd03e0b00399784c43add1465f685b6d1ab9/README.recipes.md#recipe_modules-cas
 [recipe_engine/recipe_modules/cipd]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/1b1ecd03e0b00399784c43add1465f685b6d1ab9/README.recipes.md#recipe_modules-cipd
 [recipe_engine/recipe_modules/context]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/1b1ecd03e0b00399784c43add1465f685b6d1ab9/README.recipes.md#recipe_modules-context
 [recipe_engine/recipe_modules/file]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/1b1ecd03e0b00399784c43add1465f685b6d1ab9/README.recipes.md#recipe_modules-file
diff --git a/infra/recipes/gn.expected/cq_linux.json b/infra/recipes/gn.expected/cq_linux.json
index d19691e..574d790 100644
--- a/infra/recipes/gn.expected/cq_linux.json
+++ b/infra/recipes/gn.expected/cq_linux.json
@@ -703,6 +703,185 @@
   },
   {
     "cmd": [],
+    "name": "release.linux-amd64.upload",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "RECIPE_MODULE[recipe_engine::cas]/resources/infra.sha1",
+      "/path/to/tmp/"
+    ],
+    "cwd": "[START_DIR]/gn",
+    "env": {
+      "AR": "[START_DIR]/cipd/bin/llvm-ar",
+      "CC": "[START_DIR]/cipd/bin/clang",
+      "CFLAGS": "--target=x86_64-linux-gnu --sysroot=[START_DIR]/cipd/sysroot",
+      "CXX": "[START_DIR]/cipd/bin/clang++",
+      "LDFLAGS": "--target=x86_64-linux-gnu --sysroot=[START_DIR]/cipd/sysroot -static-libstdc++"
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "gn:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "release.linux-amd64.upload.read infra revision",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@3@@@",
+      "@@@STEP_LOG_LINE@infra.sha1@git_revision:mock_infra_git_revision@@@",
+      "@@@STEP_LOG_END@infra.sha1@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "release.linux-amd64.upload.install infra/tools/luci/cas",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@3@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[START_DIR]/cipd_tool/infra/tools/luci/cas/git_revision%3Amock_infra_git_revision"
+    ],
+    "cwd": "[START_DIR]/gn",
+    "env": {
+      "AR": "[START_DIR]/cipd/bin/llvm-ar",
+      "CC": "[START_DIR]/cipd/bin/clang",
+      "CFLAGS": "--target=x86_64-linux-gnu --sysroot=[START_DIR]/cipd/sysroot",
+      "CXX": "[START_DIR]/cipd/bin/clang++",
+      "LDFLAGS": "--target=x86_64-linux-gnu --sysroot=[START_DIR]/cipd/sysroot -static-libstdc++"
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "gn:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "release.linux-amd64.upload.install infra/tools/luci/cas.ensure package directory",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@4@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "cipd",
+      "ensure",
+      "-root",
+      "[START_DIR]/cipd_tool/infra/tools/luci/cas/git_revision%3Amock_infra_git_revision",
+      "-ensure-file",
+      "infra/tools/luci/cas/${platform} git_revision:mock_infra_git_revision",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "cwd": "[START_DIR]/gn",
+    "env": {
+      "AR": "[START_DIR]/cipd/bin/llvm-ar",
+      "CC": "[START_DIR]/cipd/bin/clang",
+      "CFLAGS": "--target=x86_64-linux-gnu --sysroot=[START_DIR]/cipd/sysroot",
+      "CXX": "[START_DIR]/cipd/bin/clang++",
+      "LDFLAGS": "--target=x86_64-linux-gnu --sysroot=[START_DIR]/cipd/sysroot -static-libstdc++"
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "gn:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "release.linux-amd64.upload.install infra/tools/luci/cas.ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@4@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-git_revision:moc\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"infra/tools/luci/cas/resolved-platform\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    ]@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "[START_DIR]/cipd_tool/infra/tools/luci/cas/git_revision%3Amock_infra_git_revision/cas",
+      "archive",
+      "-cas-instance",
+      "projects/example-cas-server/instances/default_instance",
+      "-dump-digest",
+      "/path/to/tmp/",
+      "-paths",
+      "[START_DIR]/gn/out:gn"
+    ],
+    "cwd": "[START_DIR]/gn",
+    "env": {
+      "AR": "[START_DIR]/cipd/bin/llvm-ar",
+      "CC": "[START_DIR]/cipd/bin/clang",
+      "CFLAGS": "--target=x86_64-linux-gnu --sysroot=[START_DIR]/cipd/sysroot",
+      "CXX": "[START_DIR]/cipd/bin/clang++",
+      "LDFLAGS": "--target=x86_64-linux-gnu --sysroot=[START_DIR]/cipd/sysroot -static-libstdc++"
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "gn:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "release.linux-amd64.upload.upload binary to CAS",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@3@@@",
+      "@@@STEP_LINK@CAS UI@https://cas-viewer.appspot.com/projects/example-cas-server/instances/default_instance/blobs/e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855/0/tree@@@"
+    ]
+  },
+  {
+    "cmd": [],
     "name": "release.linux-arm64",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@"
@@ -774,6 +953,51 @@
     ]
   },
   {
+    "cmd": [],
+    "name": "release.linux-arm64.upload",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "[START_DIR]/cipd_tool/infra/tools/luci/cas/git_revision%3Amock_infra_git_revision/cas",
+      "archive",
+      "-cas-instance",
+      "projects/example-cas-server/instances/default_instance",
+      "-dump-digest",
+      "/path/to/tmp/",
+      "-paths",
+      "[START_DIR]/gn/out:gn"
+    ],
+    "cwd": "[START_DIR]/gn",
+    "env": {
+      "AR": "[START_DIR]/cipd/bin/llvm-ar",
+      "CC": "[START_DIR]/cipd/bin/clang",
+      "CFLAGS": "--target=aarch64-linux-gnu --sysroot=[START_DIR]/cipd/sysroot",
+      "CXX": "[START_DIR]/cipd/bin/clang++",
+      "LDFLAGS": "--target=aarch64-linux-gnu --sysroot=[START_DIR]/cipd/sysroot -static-libstdc++"
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "gn:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "release.linux-arm64.upload.upload binary to CAS",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@3@@@",
+      "@@@STEP_LINK@CAS UI@https://cas-viewer.appspot.com/projects/example-cas-server/instances/default_instance/blobs/e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855/0/tree@@@"
+    ]
+  },
+  {
     "name": "$result"
   }
 ]
\ No newline at end of file
diff --git a/infra/recipes/gn.expected/cq_mac.json b/infra/recipes/gn.expected/cq_mac.json
index 4017d0b..f9d745e 100644
--- a/infra/recipes/gn.expected/cq_mac.json
+++ b/infra/recipes/gn.expected/cq_mac.json
@@ -605,6 +605,185 @@
     ]
   },
   {
+    "cmd": [],
+    "name": "release.mac-amd64.upload",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "RECIPE_MODULE[recipe_engine::cas]/resources/infra.sha1",
+      "/path/to/tmp/"
+    ],
+    "cwd": "[START_DIR]/gn",
+    "env": {
+      "AR": "[START_DIR]/cipd/bin/llvm-ar",
+      "CC": "[START_DIR]/cipd/bin/clang",
+      "CFLAGS": "--target=x86_64-apple-darwin --sysroot=/some/xcode/path -nostdinc++ -cxx-isystem [CACHE]/macos_sdk/XCode.app/include/c++/v1",
+      "CXX": "[START_DIR]/cipd/bin/clang++",
+      "LDFLAGS": "--target=x86_64-apple-darwin --sysroot=/some/xcode/path"
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "gn:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "release.mac-amd64.upload.read infra revision",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@3@@@",
+      "@@@STEP_LOG_LINE@infra.sha1@git_revision:mock_infra_git_revision@@@",
+      "@@@STEP_LOG_END@infra.sha1@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "release.mac-amd64.upload.install infra/tools/luci/cas",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@3@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[START_DIR]/cipd_tool/infra/tools/luci/cas/git_revision%3Amock_infra_git_revision"
+    ],
+    "cwd": "[START_DIR]/gn",
+    "env": {
+      "AR": "[START_DIR]/cipd/bin/llvm-ar",
+      "CC": "[START_DIR]/cipd/bin/clang",
+      "CFLAGS": "--target=x86_64-apple-darwin --sysroot=/some/xcode/path -nostdinc++ -cxx-isystem [CACHE]/macos_sdk/XCode.app/include/c++/v1",
+      "CXX": "[START_DIR]/cipd/bin/clang++",
+      "LDFLAGS": "--target=x86_64-apple-darwin --sysroot=/some/xcode/path"
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "gn:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "release.mac-amd64.upload.install infra/tools/luci/cas.ensure package directory",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@4@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "cipd",
+      "ensure",
+      "-root",
+      "[START_DIR]/cipd_tool/infra/tools/luci/cas/git_revision%3Amock_infra_git_revision",
+      "-ensure-file",
+      "infra/tools/luci/cas/${platform} git_revision:mock_infra_git_revision",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "cwd": "[START_DIR]/gn",
+    "env": {
+      "AR": "[START_DIR]/cipd/bin/llvm-ar",
+      "CC": "[START_DIR]/cipd/bin/clang",
+      "CFLAGS": "--target=x86_64-apple-darwin --sysroot=/some/xcode/path -nostdinc++ -cxx-isystem [CACHE]/macos_sdk/XCode.app/include/c++/v1",
+      "CXX": "[START_DIR]/cipd/bin/clang++",
+      "LDFLAGS": "--target=x86_64-apple-darwin --sysroot=/some/xcode/path"
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "gn:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "release.mac-amd64.upload.install infra/tools/luci/cas.ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@4@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-git_revision:moc\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"infra/tools/luci/cas/resolved-platform\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    ]@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "[START_DIR]/cipd_tool/infra/tools/luci/cas/git_revision%3Amock_infra_git_revision/cas",
+      "archive",
+      "-cas-instance",
+      "projects/example-cas-server/instances/default_instance",
+      "-dump-digest",
+      "/path/to/tmp/",
+      "-paths",
+      "[START_DIR]/gn/out:gn"
+    ],
+    "cwd": "[START_DIR]/gn",
+    "env": {
+      "AR": "[START_DIR]/cipd/bin/llvm-ar",
+      "CC": "[START_DIR]/cipd/bin/clang",
+      "CFLAGS": "--target=x86_64-apple-darwin --sysroot=/some/xcode/path -nostdinc++ -cxx-isystem [CACHE]/macos_sdk/XCode.app/include/c++/v1",
+      "CXX": "[START_DIR]/cipd/bin/clang++",
+      "LDFLAGS": "--target=x86_64-apple-darwin --sysroot=/some/xcode/path"
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "gn:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "release.mac-amd64.upload.upload binary to CAS",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@3@@@",
+      "@@@STEP_LINK@CAS UI@https://cas-viewer.appspot.com/projects/example-cas-server/instances/default_instance/blobs/e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855/0/tree@@@"
+    ]
+  },
+  {
     "cmd": [
       "xcrun",
       "--show-sdk-path"
@@ -730,6 +909,51 @@
     ]
   },
   {
+    "cmd": [],
+    "name": "release.mac-arm64.upload",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "[START_DIR]/cipd_tool/infra/tools/luci/cas/git_revision%3Amock_infra_git_revision/cas",
+      "archive",
+      "-cas-instance",
+      "projects/example-cas-server/instances/default_instance",
+      "-dump-digest",
+      "/path/to/tmp/",
+      "-paths",
+      "[START_DIR]/gn/out:gn"
+    ],
+    "cwd": "[START_DIR]/gn",
+    "env": {
+      "AR": "[START_DIR]/cipd/bin/llvm-ar",
+      "CC": "[START_DIR]/cipd/bin/clang",
+      "CFLAGS": "--target=arm64-apple-darwin --sysroot=/some/xcode/path -nostdinc++ -cxx-isystem [CACHE]/macos_sdk/XCode.app/include/c++/v1",
+      "CXX": "[START_DIR]/cipd/bin/clang++",
+      "LDFLAGS": "--target=arm64-apple-darwin --sysroot=/some/xcode/path"
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "gn:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "release.mac-arm64.upload.upload binary to CAS",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@3@@@",
+      "@@@STEP_LINK@CAS UI@https://cas-viewer.appspot.com/projects/example-cas-server/instances/default_instance/blobs/e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855/0/tree@@@"
+    ]
+  },
+  {
     "cmd": [
       "sudo",
       "xcode-select",
diff --git a/infra/recipes/gn.expected/cq_win.json b/infra/recipes/gn.expected/cq_win.json
index df7c728..e1f742b 100644
--- a/infra/recipes/gn.expected/cq_win.json
+++ b/infra/recipes/gn.expected/cq_win.json
@@ -495,6 +495,189 @@
     ]
   },
   {
+    "cmd": [],
+    "name": "release.windows-amd64.upload",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]\\resources\\fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "RECIPE_MODULE[recipe_engine::cas]\\resources\\infra.sha1",
+      "/path/to/tmp/"
+    ],
+    "cwd": "[START_DIR]\\gn",
+    "env": {
+      "VSINSTALLDIR": "[CACHE]\\windows_sdk"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]\\windows_sdk\\win_sdk\\bin\\x64"
+      ]
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "gn:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "release.windows-amd64.upload.read infra revision",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@3@@@",
+      "@@@STEP_LOG_LINE@infra.sha1@git_revision:mock_infra_git_revision@@@",
+      "@@@STEP_LOG_END@infra.sha1@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "release.windows-amd64.upload.install infra/tools/luci/cas",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@3@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]\\resources\\fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[START_DIR]\\cipd_tool\\infra\\tools\\luci\\cas\\git_revision%3Amock_infra_git_revision"
+    ],
+    "cwd": "[START_DIR]\\gn",
+    "env": {
+      "VSINSTALLDIR": "[CACHE]\\windows_sdk"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]\\windows_sdk\\win_sdk\\bin\\x64"
+      ]
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "gn:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "release.windows-amd64.upload.install infra/tools/luci/cas.ensure package directory",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@4@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "cipd.bat",
+      "ensure",
+      "-root",
+      "[START_DIR]\\cipd_tool\\infra\\tools\\luci\\cas\\git_revision%3Amock_infra_git_revision",
+      "-ensure-file",
+      "infra/tools/luci/cas/${platform} git_revision:mock_infra_git_revision",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "cwd": "[START_DIR]\\gn",
+    "env": {
+      "VSINSTALLDIR": "[CACHE]\\windows_sdk"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]\\windows_sdk\\win_sdk\\bin\\x64"
+      ]
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "gn:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "release.windows-amd64.upload.install infra/tools/luci/cas.ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@4@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-git_revision:moc\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"infra/tools/luci/cas/resolved-platform\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    ]@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "[START_DIR]\\cipd_tool\\infra\\tools\\luci\\cas\\git_revision%3Amock_infra_git_revision\\cas",
+      "archive",
+      "-cas-instance",
+      "projects/example-cas-server/instances/default_instance",
+      "-dump-digest",
+      "/path/to/tmp/",
+      "-paths",
+      "[START_DIR]\\gn\\out:gn.exe"
+    ],
+    "cwd": "[START_DIR]\\gn",
+    "env": {
+      "VSINSTALLDIR": "[CACHE]\\windows_sdk"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]\\windows_sdk\\win_sdk\\bin\\x64"
+      ]
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "gn:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "release.windows-amd64.upload.upload binary to CAS",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@3@@@",
+      "@@@STEP_LINK@CAS UI@https://cas-viewer.appspot.com/projects/example-cas-server/instances/default_instance/blobs/e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855/0/tree@@@"
+    ]
+  },
+  {
     "cmd": [
       "taskkill.exe",
       "/f",
diff --git a/infra/recipes/gn.py b/infra/recipes/gn.py
index bfbc4f7..0f8d470 100644
--- a/infra/recipes/gn.py
+++ b/infra/recipes/gn.py
@@ -9,6 +9,7 @@
 
 DEPS = [
     'recipe_engine/buildbucket',
+    'recipe_engine/cas',
     'recipe_engine/cipd',
     'recipe_engine/context',
     'recipe_engine/file',
@@ -260,16 +261,20 @@
             if target.is_host:
               api.step('test', [src_dir.join('out', 'gn_unittests')])
 
-            if build_input.gerrit_changes:
-              continue
-
             if config['name'] != 'release':
               continue
 
             with api.step.nest('upload'):
-              cipd_pkg_name = 'gn/gn/%s' % target.platform
               gn = 'gn' + ('.exe' if target.is_win else '')
 
+              if build_input.gerrit_changes:
+                # Upload to CAS from CQ.
+                api.cas.archive('upload binary to CAS', src_dir.join('out'),
+                                src_dir.join('out', gn))
+                continue
+
+              cipd_pkg_name = 'gn/gn/%s' % target.platform
+
               pkg_def = api.cipd.PackageDefinition(
                   package_name=cipd_pkg_name,
                   package_root=src_dir.join('out'),