Use eraseArea() Skia method to optimize zeroFillFrameRect()

BUG=

Review URL: https://chromiumcodereview.appspot.com/18377003

git-svn-id: svn://svn.chromium.org/blink/trunk@153370 bbb929c8-8fbe-4397-9dbb-9b2b20218538
New baselines for pixel references after change in compositor's anti aliasing shader.

R=enne@chromium.org
BUG=255667

Review URL: https://codereview.chromium.org/18387002

git-svn-id: svn://svn.chromium.org/blink/trunk@153371 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Rebase webaudio codec tests for Win.

BUG=237676
R=dalecurtis@chromium.org

Review URL: https://codereview.chromium.org/18121012

git-svn-id: svn://svn.chromium.org/blink/trunk@153372 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Revert 153294 "Remove AtomicStringImpl."

> Remove AtomicStringImpl.
> 
> We believe it's a nop, and a confusing one at that.
> 
> BUG=250050
> 
> Review URL: https://chromiumcodereview.appspot.com/18228003

TBR=cevans@chromium.org

Review URL: https://codereview.chromium.org/18196004

git-svn-id: svn://svn.chromium.org/blink/trunk@153373 bbb929c8-8fbe-4397-9dbb-9b2b20218538