Move compositor support out of base WebKitPlatformSupport into renderer

Move compositor support out of base WebKitPlatformSupport into renderer

WebCompositorSupport is a tear-off of WebKit::Platform that provides WebKit
with access to compositing classes. This is only needed by renderers and by
DumpRenderTree+webkit_unit_tests. Having it linked in to the base chromium
implementation of WebKit::Platform pulled the compositor support into every
embedding of WebKit, including browser process embeddings, unnecessarily.

BUG=237267
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=199318

[jamesr, 2013-05-09 18:30:55]

PTAL.

[piman, 2013-05-09 18:43:41]

On 2013/05/09 18:30:55, jamesr wrote:
> PTAL.

LGTM, but can you double-check we're not implicitly relying on this on aura?

[jamesr, 2013-05-09 19:59:13]

Removed a bit more (forward declaration in webkit/glue and the content_unittests
harness).

git grep can't find any refs to compositorSupport, WebCompositorSupport or
WebLayer in the aura code.

[piman, 2013-05-09 20:04:20]

lgtm

[commit-bot: I haz the power, 2013-05-09 20:50:24]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jamesr@chromium.org/14619019/5011

[commit-bot: I haz the power, 2013-05-10 01:00:01]

Change committed as 199318