Roll ANGLE.

This roll includes the change that disable a texture to be read/write at the same time: https://code.google.com/p/angleproject/issues/detail?id=496

BUG=
TEST=tree
R=kbr@chromium.org
TBR=kbr@chromium.org

Review URL: https://codereview.chromium.org/54463005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232884 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232884