GN bootstrap fixes:

- add missing file to compile
- fix final build directory (and make --output work)

BUG=none
R=dpranke@chromium.org,tfarina@chromium.org

Review URL: https://codereview.chromium.org/1411303008

Cr-Original-Commit-Position: refs/heads/master@{#356999}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 6a5bdd901706d4c8e8e66478336d5f4ed72aa356
1 file changed
tree: c0e1f25d8e8262657c58de31c7801e087413a921
  1. tools/