GitLab

This CL re-lands https://codereview.chromium.org/410033002 while addressed a few issues.
1. --results-directory must be passed along with --generate-gtest-json
2. --test-platform, --annotate, --build-number, --builder-name should be passed in order to upload results to correct dashboard
3. This CL depends on https://codereview.chromium.org/414223011/ to fix a bug in runtest.py

BUG=329102
R=yfriedman@chromium.org, navabi@chromium.org, jbudorick@chromium.org

Review URL: https://codereview.chromium.org/414383002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288134 0039d316-1c4b-4281-b951-d872f2087c98