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diff --git a/content/browser/compositor/reflector_impl.h b/content/browser/compositor/reflector_impl.h
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+++ b/content/browser/compositor/reflector_impl.h
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+// 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 CONTENT_BROWSER_COMPOSITOR_REFLECTOR_IMPL_H_
+#define CONTENT_BROWSER_COMPOSITOR_REFLECTOR_IMPL_H_
+
+#include "base/id_map.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "content/browser/compositor/image_transport_factory.h"
+#include "ui/compositor/reflector.h"
+#include "ui/gfx/size.h"
+
+namespace base { class MessageLoopProxy; }
+
+namespace gfx { class Rect; }
+
+namespace ui {
+class Compositor;
+class Layer;
+}
+
+namespace content {
+
+class BrowserCompositorOutputSurface;
+
+// A reflector implementation that copies the framebuffer content
+// to the texture, then draw it onto the mirroring compositor.
+class ReflectorImpl : public ImageTransportFactoryObserver,
+                      public base::SupportsWeakPtr<ReflectorImpl>,
+                      public ui::Reflector {
+ public:
+  ReflectorImpl(
+      ui::Compositor* mirrored_compositor,
+      ui::Layer* mirroring_layer,
+      IDMap<BrowserCompositorOutputSurface>* output_surface_map,
+      int surface_id);
+
+  ui::Compositor* mirrored_compositor() {
+    return mirrored_compositor_;
+  }
+
+  void InitOnImplThread();
+  void Shutdown();
+  void ShutdownOnImplThread();
+
+  // This must be called on ImplThread, or before the surface is passed to
+  // ImplThread.
+  void AttachToOutputSurface(BrowserCompositorOutputSurface* surface);
+
+  // ui::Reflector implementation.
+  virtual void OnMirroringCompositorResized() OVERRIDE;
+
+  // ImageTransportFactoryObsever implementation.
+  virtual void OnLostResources() OVERRIDE;
+
+  // Called when the output surface's size has changed.
+  // This must be called on ImplThread.
+  void OnReshape(gfx::Size size);
+
+  // Called in |BrowserCompositorOutputSurface::SwapBuffers| to copy
+  // the full screen image to the |texture_id_|. This must be called
+  // on ImplThread.
+  void OnSwapBuffers();
+
+  // Called in |BrowserCompositorOutputSurface::PostSubBuffer| copy
+  // the sub image given by |rect| to the texture.This must be called
+  // on ImplThread.
+  void OnPostSubBuffer(gfx::Rect rect);
+
+  // Create a shared texture that will be used to copy the content of
+  // mirrored compositor to the mirroring compositor.  This must be
+  // called before the reflector is attached to OutputSurface to avoid
+  // race with ImplThread accessing |texture_id_|.
+  void CreateSharedTexture();
+
+  // Called when the source surface is bound and available. This must
+  // be called on ImplThread.
+  void OnSourceSurfaceReady(int surface_id);
+
+ private:
+  virtual ~ReflectorImpl();
+
+  void UpdateTextureSizeOnMainThread(gfx::Size size);
+
+  // Request full redraw on mirroring compositor.
+  void FullRedrawOnMainThread(gfx::Size size);
+
+  void UpdateSubBufferOnMainThread(gfx::Size size, gfx::Rect rect);
+
+  // Request full redraw on mirrored compositor so that
+  // the full content will be copied to mirroring compositor.
+  void FullRedrawContentOnMainThread();
+
+  // This exists just to hold a reference to a ReflectorImpl in a post task,
+  // so the ReflectorImpl gets deleted when the function returns.
+  static void DeleteOnMainThread(scoped_refptr<ReflectorImpl> reflector) {}
+
+  // These variables are initialized on MainThread before
+  // the reflector is attached to the output surface. Once
+  // attached, they must be accessed only on ImplThraed unless
+  // the context is lost. When the context is lost, these
+  // will be re-ininitiailzed when the new output-surface
+  // is created on MainThread.
+  int texture_id_;
+  gfx::Size texture_size_;
+
+  // Must be accessed only on ImplThread.
+  IDMap<BrowserCompositorOutputSurface>* output_surface_map_;
+  scoped_ptr<GLHelper> gl_helper_;
+
+  // Must be accessed only on MainThread.
+  ui::Compositor* mirrored_compositor_;
+  ui::Compositor* mirroring_compositor_;
+  ui::Layer* mirroring_layer_;
+  scoped_refptr<ui::Texture> shared_texture_;
+  scoped_refptr<base::MessageLoopProxy> impl_message_loop_;
+  scoped_refptr<base::MessageLoopProxy> main_message_loop_;
+  int surface_id_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_COMPOSITOR_REFLECTOR_IMPL_H_