WIP - compositor worker mega patch.

third_party/WebKit/public/platform/WebCompositorSupport.h

Index: third_party/WebKit/public/platform/WebCompositorSupport.h
diff --git a/third_party/WebKit/public/platform/WebCompositorSupport.h b/third_party/WebKit/public/platform/WebCompositorSupport.h
index cccede656b3b3c7b9a31d2215ca1c40795911d22..d06c6e5c16be2e8b6c3ddff0babe1d4ae91c687b 100644
--- a/third_party/WebKit/public/platform/WebCompositorSupport.h
+++ b/third_party/WebKit/public/platform/WebCompositorSupport.h
@@ -52,6 +52,8 @@ class WebFilterOperations;
 class WebFloatAnimationCurve;
 class WebGraphicsContext3D;
 class WebImageLayer;
+class WebMutator;
+class WebMutatorClient;
 class WebLayer;
 class WebScrollbarLayer;
 class WebScrollbarThemeGeometry;
@@ -101,6 +103,8 @@ public:
 
     virtual WebCompositorAnimationTimeline* createAnimationTimeline() { return nullptr; }
 
+    virtual WebMutatorClient* createMutatorClient(WebMutator*) { return nullptr; }
+
 protected:
     virtual ~WebCompositorSupport() { }
 };