[chromium] Introduce setting for low latency rendering
https://bugs.webkit.org/show_bug.cgi?id=104011

Patch by Sami Kyostila <skyostil@chromium.org> on 2012-12-06
Reviewed by James Robinson.

This low latency rendering setting will be used to enable alternate
render signaling and scheduling to reduce latency.

Source/Platform:

* chromium/public/WebLayerTreeView.h:
(WebKit::WebLayerTreeView::Settings::Settings):
(Settings):

Source/WebKit/chromium:

* public/WebSettings.h:
* src/WebSettingsImpl.cpp:
(WebKit::WebSettingsImpl::WebSettingsImpl):
(WebKit::WebSettingsImpl::setLowLatencyRenderingEnabled):
(WebKit):
* src/WebSettingsImpl.h:
(WebSettingsImpl):
(WebKit::WebSettingsImpl::lowLatencyRenderingEnabled):
* src/WebViewImpl.cpp:
(WebKit::WebViewImpl::setIsAcceleratedCompositingActive):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk/Source/Platform/chromium/public@136926 268f45cc-cd09-0410-ab3c-d52691b4dbfc