GitLab

This feature can be enabled with "enable-embedded-singin" command-line switch.

BUG=308312
TEST=manually
NOTRY=true

Review URL: https://codereview.chromium.org/296173008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272971 0039d316-1c4b-4281-b951-d872f2087c98