Refactors event dispatching of NativeViewport into its own interface

mojo/services/native_viewport/native_viewport_impl.h

 // Copyright 2014 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 MOJO_SERVICES_NATIVE_VIEWPORT_IMPL_H_
 #define MOJO_SERVICES_NATIVE_VIEWPORT_IMPL_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "cc/surfaces/surface_id.h"
@@ skipping 17 matching lines @@
   NativeViewportImpl(ApplicationImpl* app, bool is_headless);
   ~NativeViewportImpl() override;
 
   // InterfaceImpl<NativeViewport> implementation.
   void Create(SizePtr size, const Callback<void(uint64_t)>& callback) override;
   void Show() override;
   void Hide() override;
   void Close() override;
   void SetSize(SizePtr size) override;
   void SubmittedFrame(SurfaceIdPtr surface_id) override;
+  void SetEventDispatcher(NativeViewportEventDispatcherPtr dispatcher) override;
 
   // PlatformViewport::Delegate implementation.
   void OnBoundsChanged(const gfx::Rect& bounds) override;
   void OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget) override;
   bool OnEvent(ui::Event* ui_event) override;
   void OnDestroyed() override;
 
   void AckEvent();
 
  private:
   void ProcessOnBoundsChanged();
 
   bool is_headless_;
   scoped_ptr<PlatformViewport> platform_viewport_;
   scoped_ptr<ViewportSurface> viewport_surface_;
   uint64_t widget_id_;
   gfx::Size size_;
   GpuPtr gpu_service_;
   SurfacesServicePtr surfaces_service_;
   cc::SurfaceId child_surface_id_;
   bool waiting_for_event_ack_;
   Callback<void(uint64_t)> create_callback_;
+  NativeViewportEventDispatcherPtr event_dispatcher_;
   base::WeakPtrFactory<NativeViewportImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeViewportImpl);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_NATIVE_VIEWPORT_IMPL_H_