R=agable@chromium.org, dnj@chromium.org, mmoss@chromium.org
BUG=600028

Review URL: https://codereview.chromium.org/1848353003 .

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@299677 0039d316-1c4b-4281-b951-d872f2087c98