WIP - compositor worker mega patch.

third_party/WebKit/Source/web/CompositorMutatorImpl.h

Index: third_party/WebKit/Source/web/CompositorMutatorImpl.h
diff --git a/third_party/WebKit/Source/web/CompositorMutatorImpl.h b/third_party/WebKit/Source/web/CompositorMutatorImpl.h
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+++ b/third_party/WebKit/Source/web/CompositorMutatorImpl.h
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+// 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 CompositorMutatorImpl_h
+#define CompositorMutatorImpl_h
+
+#include "platform/graphics/CompositorMutator.h"
+#include "wtf/HashSet.h"
+#include "wtf/Noncopyable.h"
+#include "wtf/OwnPtr.h"
+#include "wtf/PassOwnPtr.h"
+
+namespace blink {
+
+class CompositorProxy;
+class CompositorProxyClient;
+class CompositorProxyClientImpl;
+class CompositorWorkerGlobalScope;
+class CompositorMutatorClient;
+class WebWaitableEvent;
+
+class CompositorMutatorImpl final : public CompositorMutator {
+    WTF_MAKE_NONCOPYABLE(CompositorMutatorImpl);
+
+public:
+    static PassOwnPtr<CompositorMutatorImpl> create();
+    ~CompositorMutatorImpl() override;
+
+    // CompositorMutator implementation.
+    bool mutate(double timeNow, CompositorMutableStateProvider* state) override;
+
+    void registerClient(CompositorProxyClientImpl*);
+    void unregisterClient(CompositorProxyClientImpl*);
+
+    CompositorProxyClient* createCompositorProxyClient();
+    CompositorMutatorClient* client() { return m_client.get(); }
+
+    void setNeedsMutate();
+
+private:
+    CompositorMutatorImpl();
+
+    typedef HashSet<CompositorProxyClientImpl*> Clients;
+    Clients m_clients;
+
+    OwnPtr<CompositorMutatorClient> m_client;
+};
+
+} // namespace blink
+
+#endif // CompositorMutatorImpl_h