cc: Split Proxy and TaskRunnerProvider for the LayerTreeHost

cc/trees/proxy.h

 // Copyright 2011 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 CC_TREES_PROXY_H_
 #define CC_TREES_PROXY_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 10 matching lines @@
 namespace gfx {
 class Rect;
 class Vector2d;
 }
 
 namespace cc {
 class LayerTreeDebugState;
 class OutputSurface;
 struct RendererCapabilities;
 
-// Abstract class responsible for proxying commands from the main-thread side of
-// the compositor over to the compositor implementation.
-class CC_EXPORT Proxy : public TaskRunnerProvider {
+// Abstract interface responsible for proxying commands from the main-thread
+// side of the compositor over to the compositor implementation.
+class CC_EXPORT Proxy {
  public:
-  ~Proxy() override;
+  virtual ~Proxy() {}
 
   virtual void FinishAllRendering() = 0;
 
   virtual bool IsStarted() const = 0;
   virtual bool CommitToActiveTree() const = 0;
 
   // Will call LayerTreeHost::OnCreateAndInitializeOutputSurfaceAttempted
   // with the result of this function.
   virtual void SetOutputSurface(OutputSurface* output_surface) = 0;
 
@@ skipping 32 matching lines @@
 
   virtual void SetAuthoritativeVSyncInterval(
       const base::TimeDelta& interval) = 0;
 
   virtual void UpdateTopControlsState(TopControlsState constraints,
                                       TopControlsState current,
                                       bool animate) = 0;
 
   // Testing hooks
   virtual bool MainFrameWillHappenForTesting() = 0;
-
- protected:
-  Proxy(scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
-        scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(Proxy);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROXY_H_