gpu: Disables EXT_discard_framebuffer extension on Vivante GPUs.

Discarding framebuffer doesn't accept trivial attachments which causes GL errors. On a debug build these errors cause the browser to hang.

BUG=299494

Review URL: https://codereview.chromium.org/25416002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226329 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226329
Disable requestAutocomplete

revert this patch!

BUG=none
R=dbeam@chromium.org
TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/25397002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226330 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226330