Initial commit of v2, an experiment to divine a simpler API for a hardware accelerated UI framework that can be used to write both a window manager and UI controls.

BUG=none
TBR=sky@chromium.org

Review URL: https://codereview.chromium.org/25079003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225795 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 225795