Add most of base/ build/ buildtools/ testing/ third_party/googletest/

Enough to make ./tools/gn/bootstrap/bootstrap.py work on Linux.

Change-Id: I94de95f1ce87dd3672d1a99c62254edee8be45bd
Reviewed-on: https://gn-review.googlesource.com/1100
Reviewed-by: Petr Hosek <phosek@google.com>
Commit-Queue: Scott Graham <scottmg@chromium.org>
diff --git a/buildtools/clang_format/README.chromium b/buildtools/clang_format/README.chromium
new file mode 100644
index 0000000..514b77c
--- /dev/null
+++ b/buildtools/clang_format/README.chromium
@@ -0,0 +1,15 @@
+Name: clang-format
+Short Name: clang-format
+URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/tools/clang-format/
+Version: 5.0.0
+Date: 14 Jun 2017
+Revision: See DEPS
+License: University of Illinois/NCSA Open Source License
+License File: NOT_SHIPPED
+Security Critical: No
+
+Description:
+A tool for formatting C++ code to style.
+
+Local Modifications:
+None