compositor-worker: Initialize CW machinery plumbing to compositor and fire CW rAF callbacks.

third_party/WebKit/Source/core/page/ChromeClient.h

Index: third_party/WebKit/Source/core/page/ChromeClient.h
diff --git a/third_party/WebKit/Source/core/page/ChromeClient.h b/third_party/WebKit/Source/core/page/ChromeClient.h
index f2ec44ba39007f11082721c502c30606c9df06ba..110ba4db875cf5f0feaf959f145b785535467daf 100644
--- a/third_party/WebKit/Source/core/page/ChromeClient.h
+++ b/third_party/WebKit/Source/core/page/ChromeClient.h
@@ -49,6 +49,7 @@ class AXObject;
 class ColorChooser;
 class ColorChooserClient;
 class CompositorAnimationTimeline;
+class CompositorProxyClient;
 class DateTimeChooser;
 class DateTimeChooserClient;
 class Element;
@@ -268,6 +269,8 @@ public:
     virtual void registerPopupOpeningObserver(PopupOpeningObserver*) = 0;
     virtual void unregisterPopupOpeningObserver(PopupOpeningObserver*) = 0;
 
+    virtual CompositorProxyClient* createCompositorProxyClient() = 0;
+
     virtual FloatSize elasticOverscroll() const { return FloatSize(); }
 
     // Called when observed XHR, fetch, and other fetch request with non-GET