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

third_party/WebKit/Source/platform/graphics/CompositorMutatorClient.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CompositorMutatorClient_h
 #define CompositorMutatorClient_h
 
 #include "platform/PlatformExport.h"
 #include "public/platform/WebCompositorMutatorClient.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
+class CompositorMutator;
 struct CompositorMutations;
 class CompositorMutationsTarget;
 
 class PLATFORM_EXPORT CompositorMutatorClient : public WebCompositorMutatorClient {
 public:
-    CompositorMutatorClient(CompositorMutationsTarget*);
+    CompositorMutatorClient(CompositorMutator*, CompositorMutationsTarget*);
     virtual ~CompositorMutatorClient();
 
+    void setNeedsMutate();
+
     // cc::LayerTreeMutator
+    bool Mutate(base::TimeTicks timeNow) override;
+    void SetClient(cc::LayerTreeMutatorClient*) override;
     base::Closure TakeMutations() override;
 
     void setMutationsForTesting(PassOwnPtr<CompositorMutations>);
 private:
+    cc::LayerTreeMutatorClient* m_client;
+    CompositorMutator* m_mutator;
     CompositorMutationsTarget* m_mutationsTarget;
     OwnPtr<CompositorMutations> m_mutations;
 };
 
 } // namespace blink
 
 #endif // CompositorMutatorClient_h