Mac: Fix deadlock with compositor

The problem was that some of the IOSurface messages weren't dispatched to the UI thread, and cocoa isn't happy when it's not called from the UI thread.

BUG=52798
TEST=see bug

Review URL: http://codereview.chromium.org/3124045

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@57443 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed