GitLab

SynchronousCompositorFactory does not create the main thread
one since we have not figured out how to get its clients
(video/webgl/canvas) to work in this architecture. This will
cause dynamic but graceful failures when trying to load these
type of contents.

For compositor thread one, create ContextProviderInProcess.

BUG=230197,239760
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/16235005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@204941 0039d316-1c4b-4281-b951-d872f2087c98