Plumb CompositedDisplayList to WebViewImpl

Source/core/page/ChromeClient.h

Index: Source/core/page/ChromeClient.h
diff --git a/Source/core/page/ChromeClient.h b/Source/core/page/ChromeClient.h
index f14b29f7bba9fecf1143d1d744b59e9a7b04948d..a7537ebdc58b90728aa99cd7f0a759eaa33bc7e4 100644
--- a/Source/core/page/ChromeClient.h
+++ b/Source/core/page/ChromeClient.h
@@ -62,6 +62,7 @@ class LocalFrame;
 class Node;
 class Page;
 class PopupOpeningObserver;
+class WebCompositedDisplayList;
 class WebCompositorAnimationTimeline;
 
 struct CompositedSelection;
@@ -183,6 +184,9 @@ public:
     // one. Otherwise it sets it for the WebViewImpl.
     virtual void attachRootGraphicsLayer(GraphicsLayer*, LocalFrame* localRoot) = 0;
 
+    virtual void setCompositedDisplayList(PassOwnPtr<WebCompositedDisplayList>) { }
+    virtual WebCompositedDisplayList* compositedDisplayListForTesting() { return nullptr; }
+
     virtual void attachCompositorAnimationTimeline(WebCompositorAnimationTimeline*, LocalFrame* localRoot) { }
     virtual void detachCompositorAnimationTimeline(WebCompositorAnimationTimeline*, LocalFrame* localRoot) { }