WIP - compositor worker mega patch.

third_party/WebKit/public/platform/WebLayerTreeView.h

Index: third_party/WebKit/public/platform/WebLayerTreeView.h
diff --git a/third_party/WebKit/public/platform/WebLayerTreeView.h b/third_party/WebKit/public/platform/WebLayerTreeView.h
index 441c36f553fb3eda68a11589bd80694d71add796..ab4d0d07362f8732759b59e966b573b6c1575d45 100644
--- a/third_party/WebKit/public/platform/WebLayerTreeView.h
+++ b/third_party/WebKit/public/platform/WebLayerTreeView.h
@@ -42,6 +42,7 @@ class WebCompositeAndReadbackAsyncCallback;
 class WebCompositorAnimationTimeline;
 class WebLayer;
 class WebLayoutAndPaintAsyncCallback;
+class WebMutatorClient;
 struct WebPoint;
 struct WebSelectionBound;
 class WebSelection;
@@ -156,6 +157,9 @@ public:
 
     // Toggles scroll bottleneck rects on the HUD layer
     virtual void setShowScrollBottleneckRects(bool) { }
+
+    // Mutations are plumbed back to the layer tree via the WebMutatorClient
+    virtual void setMutatorClient(WebMutatorClient*) {}
 };
 
 } // namespace blink