[chromium] Use DumpRenderTree-specific interface for DRT's compositor embedding
https://bugs.webkit.org/show_bug.cgi?id=111017

Reviewed by Adam Barth.

This decouples DumpRenderTree from WebLayerTreeViewClient.

* DumpRenderTree/chromium/WebViewHost.cpp:
(WebViewHostDRTLayerTreeViewClient):
(WebViewHostDRTLayerTreeViewClient::WebViewHostDRTLayerTreeViewClient):
(WebViewHostDRTLayerTreeViewClient::~WebViewHostDRTLayerTreeViewClient):
(WebViewHostDRTLayerTreeViewClient::Layout):
(WebViewHostDRTLayerTreeViewClient::ScheduleComposite):
(WebViewHost::initializeLayerTreeView):
* DumpRenderTree/chromium/WebViewHost.h:
(webkit_support):
(WebViewHost):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144398 268f45cc-cd09-0410-ab3c-d52691b4dbfc