Making ImageBuffer fallback to non-platform buffer when GPU-accelerated buffer allocation fails.

BUG=259441

Review URL: https://chromiumcodereview.appspot.com/18812007

git-svn-id: svn://svn.chromium.org/blink/trunk@154047 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Removing Canvas2DLayerBridge::ThreadMode, which is no longer needed

BUG=190369

Review URL: https://chromiumcodereview.appspot.com/5891733057437696

git-svn-id: svn://svn.chromium.org/blink/trunk@154048 bbb929c8-8fbe-4397-9dbb-9b2b20218538
WebM file containing WebVTT cues for inband text track testing.

BUG=230708
TEST=None. This is just a content file that will be used for testing.

TBR=matthewjheaney

Review URL: https://codereview.chromium.org/18200005

git-svn-id: svn://svn.chromium.org/blink/trunk@154049 bbb929c8-8fbe-4397-9dbb-9b2b20218538
core/accessibility: Include wtf files using "wtf/foo.h" form.

Instead of including them as:

\#include <wtf/foo.h>

Change it to include as:

\#include "wtf/foo.h"

Patch generated with thakis's script:

git grep -l '#include <wtf' Source/core/accessibility | xargs sed -i -e 's/#include <\(wtf\/[^>]*\)>/#include "\1"/'

BUG=254653
R=abarth@chromium.org,thakis@chromium.org

Review URL: https://chromiumcodereview.appspot.com/5747559595245568

git-svn-id: svn://svn.chromium.org/blink/trunk@154050 bbb929c8-8fbe-4397-9dbb-9b2b20218538