https://bugs.webkit.org/show_bug.cgi?id=102419

Reviewed by Andreas Kling.

Add a single -[WKView _setAcceleratedCompositingModeRootLayer:] method and have
the existing PageClientImpl member functions call it. Also, add a new
PageClient member function, setAcceleratedCompositingRootLayer.

* UIProcess/API/mac/PageClientImpl.h:
* UIProcess/API/mac/PageClientImpl.mm:
(WebKit::PageClientImpl::enterAcceleratedCompositingMode):
(WebKit::PageClientImpl::exitAcceleratedCompositingMode):
(WebKit::PageClientImpl::updateAcceleratedCompositingMode):
(WebKit::PageClientImpl::setAcceleratedCompositingRootLayer):
* UIProcess/API/mac/WKView.mm:
(-[WKView _processDidCrash]):
(-[WKView _setAcceleratedCompositingModeRootLayer:]):
* UIProcess/API/mac/WKViewInternal.h:
* UIProcess/PageClient.h:
* UIProcess/WebPageProxy.h:
* UIProcess/mac/RemoteLayerTreeHost.mm:
(WebKit::RemoteLayerTreeHost::commit):
* UIProcess/mac/WebPageProxyMac.mm:
(WebKit::WebPageProxy::setAcceleratedCompositingRootLayer):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@134820 268f45cc-cd09-0410-ab3c-d52691b4dbfc