GitLab

Extracted from http://codereview.chromium.org/7067020/ to make it possible to run it on the try-server.

BUG=chromium-os:14880
TEST=Check that slideshow images show correctly.

Review URL: http://codereview.chromium.org/7077005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86808 0039d316-1c4b-4281-b951-d872f2087c98