GitLab

This is an output surface that displays the content using
overlays and render-to-FBO, instead of the usual system-managed
framebuffer. Implementation to follow in another CL.

BUG=380861
TBR=stevenjb

Review URL: https://codereview.chromium.org/433543002

Cr-Commit-Position: refs/heads/master@{#290072}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@290072 0039d316-1c4b-4281-b951-d872f2087c98