Revert 173540 "Use skia discardable memory for decoded images on..."

Appears to break webkit_unit_tests:
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Android%20%28Nexus4%29/builds/13112

> Use skia discardable memory for decoded images on Android.
> 
> BUG=330041
> 
> Review URL: https://codereview.chromium.org/266633010

TBR=reveman@chromium.org

Review URL: https://codereview.chromium.org/274563005

git-svn-id: svn://svn.chromium.org/blink/trunk@173569 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Fix typo.

BUG=38618
TEST=none
TBR=senorblanco

Review URL: https://codereview.chromium.org/276593002

git-svn-id: svn://svn.chromium.org/blink/trunk@173570 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Rebaseline additional failures from r173562

R=japhet@chromium.org
NOTRY=true
BUG=361729

Review URL: https://codereview.chromium.org/272693003

git-svn-id: svn://svn.chromium.org/blink/trunk@173571 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Make WebWidget::compositeAndReadbackAsync() return void.

This method returns false when isAcceleratedCompositingActive() is
not enabled. In the future this will always be enabled (at least for
callers of the compositeAndReadbackAsync() method), so having to
support a branch and NOTREACHED() at each call site it awkward.

Instead make this method ASSSERT(isAcceleratedCompositingActive()) and
not return a value.

R=abarth
BUG=251960

Review URL: https://codereview.chromium.org/263253002

git-svn-id: svn://svn.chromium.org/blink/trunk@173572 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Auto-rebaseline for r173545

http://src.chromium.org/viewvc/blink?view=revision&revision=173545

BUG=367088
TBR=dominik.rottsches@intel.com

Review URL: https://codereview.chromium.org/268353007

git-svn-id: svn://svn.chromium.org/blink/trunk@173573 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove compositing trigger for will-change: top (and similar)

We can't use will-change: top (and similar) as a compositing trigger because it
changes the paint order by giving the RenderObject a RenderLayer of type
NormalLayer. That will cause us to paint incorrectly.

In a future CL, we could consider this property as a compositing hint if the
RenderObject already has a self-painting RenderLayer. However, let's first
restore correctness in the system before making that change.

R=esprehn@chromium.org
BUG=370604

Review URL: https://codereview.chromium.org/271753002

git-svn-id: svn://svn.chromium.org/blink/trunk@173574 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add the picture element

Add the DOM part of the picture element, without actually using it for anything useful just yet.

BUG=368830

Review URL: https://codereview.chromium.org/261823002

git-svn-id: svn://svn.chromium.org/blink/trunk@173575 bbb929c8-8fbe-4397-9dbb-9b2b20218538