This pulls r1084 from the chromium on upstream rietveld.

R=jparent@chromium.org, maruel@chromium.org
BUG=247791

Review URL: https://chromiumcodereview.appspot.com/16744006

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@206743 0039d316-1c4b-4281-b951-d872f2087c98