WIP - compositor worker mega patch.

third_party/WebKit/public/platform/WebCompositorMutatorClient.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 WebCompositorMutatorClient_h
+#define WebCompositorMutatorClient_h
+
+#include "cc/animation/layer_tree_mutator.h"
+
+namespace blink {
+
+// This is used by the compositor to invoke compositor worker callbacks.
+class WebCompositorMutatorClient : public cc::LayerTreeMutator {
+public:
+    virtual ~WebCompositorMutatorClient() { }
+};
+
+} // namespace blink
+
+#endif // WebCompositorMutatorClient_h