Coordinated Graphics: Remove CoordinatedGraphicsLayer::setRootLayer().
https://bugs.webkit.org/show_bug.cgi?id=111835

Patch by Huang Dongsung <luxtella@company100.net> on 2013-03-12
Reviewed by Luiz Agostini.

Source/WebCore:

This patch removes CoordinatedGraphicsLayer::setRootLayer() because
CoordinatedGraphicsScene already knows which layer is root.

No new tests, no behavior change.

* platform/graphics/texmap/coordinated/CoordinatedGraphicsLayer.cpp:
* platform/graphics/texmap/coordinated/CoordinatedGraphicsLayer.h:
(CoordinatedGraphicsLayer):
* platform/graphics/texmap/coordinated/CoordinatedGraphicsScene.cpp:
(WebCore::CoordinatedGraphicsScene::setLayerState):
* platform/graphics/texmap/coordinated/CoordinatedGraphicsState.h:
(WebCore::CoordinatedGraphicsLayerState::CoordinatedGraphicsLayerState):

Source/WebKit2:

Amend CoordinatedLayerTreeHost because
CoordinatedGraphicsLayer::setRootLayer() is removed.

* WebProcess/WebPage/CoordinatedGraphics/CoordinatedLayerTreeHost.cpp:
(WebKit::CoordinatedLayerTreeHost::CoordinatedLayerTreeHost):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@145670 268f45cc-cd09-0410-ab3c-d52691b4dbfc