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diff --git a/content/browser/renderer_host/accelerated_surface_container_mac.h b/content/browser/renderer_host/accelerated_surface_container_mac.h
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+// Copyright (c) 2010 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_RENDERER_HOST_GPU_PLUGIN_CONTAINER_MAC_H_
+#define CONTENT_BROWSER_RENDERER_HOST_GPU_PLUGIN_CONTAINER_MAC_H_
+#pragma once
+
+// The "GPU plugin" is currently implemented as a special kind of
+// NPAPI plugin to provide high-performance on-screen 3D rendering for
+// Pepper 3D.
+//
+// On Windows and X11 platforms the GPU plugin relies on cross-process
+// parenting of windows, which is not supported via any public APIs in
+// the Mac OS X window system.
+//
+// To achieve full hardware acceleration we use the new IOSurface APIs
+// introduced in Mac OS X 10.6. The GPU plugin's process produces an
+// IOSurface and renders into it using OpenGL. It uses the
+// IOSurfaceGetID and IOSurfaceLookup APIs to pass a reference to this
+// surface to the browser process for on-screen rendering. The GPU
+// plugin essentially looks like a windowless plugin; the browser
+// process gets all of the mouse events, because the plugin process
+// does not have an on-screen window.
+//
+// This class encapsulates some of the management of these data
+// structures, in conjunction with the AcceleratedSurfaceContainerManagerMac.
+
+#include <CoreFoundation/CoreFoundation.h>
+#include <OpenGL/OpenGL.h>
+
+#include "app/surface/transport_dib.h"
+#include "base/basictypes.h"
+#include "base/mac/scoped_cftyperef.h"
+#include "base/scoped_ptr.h"
+#include "ui/gfx/native_widget_types.h"
+#include "ui/gfx/rect.h"
+
+namespace webkit {
+namespace npapi {
+struct WebPluginGeometry;
+}
+}
+
+class AcceleratedSurfaceContainerManagerMac;
+
+class AcceleratedSurfaceContainerMac {
+ public:
+  AcceleratedSurfaceContainerMac(
+      AcceleratedSurfaceContainerManagerMac* manager,
+      bool opaque);
+  virtual ~AcceleratedSurfaceContainerMac();
+
+  // Sets the backing store and size of this accelerated surface container.
+  // There are two versions: the IOSurface version is used on systems where the
+  // IOSurface API is supported (Mac OS X 10.6 and later); the TransportDIB is
+  // used on Mac OS X 10.5 and earlier.
+  void SetSizeAndIOSurface(int32 width,
+                           int32 height,
+                           uint64 io_surface_identifier);
+  void SetSizeAndTransportDIB(int32 width,
+                              int32 height,
+                              TransportDIB::Handle transport_dib);
+
+  // Tells the accelerated surface container that its geometry has changed,
+  // for example because of a scroll event. (Note that the container
+  // currently only pays attention to the clip width and height, since the
+  // view in which it is hosted is responsible for positioning it on the
+  // page.)
+  void SetGeometry(const webkit::npapi::WebPluginGeometry& geom);
+
+  // Draws this accelerated surface's contents, texture mapped onto a quad in
+  // the given OpenGL context. TODO(kbr): figure out and define exactly how the
+  // coordinate system will work out.
+  void Draw(CGLContextObj context);
+
+  // Causes the next Draw call to trigger a texture upload. Should be called any
+  // time the drawing context has changed.
+  void ForceTextureReload() { texture_needs_upload_ = true; }
+
+  // Returns if the surface should be shown.
+  bool ShouldBeVisible() const;
+
+  // Notifies the the container that its surface was painted to.
+  void set_was_painted_to(uint64 surface_id);
+
+  // Notifies the container that its surface is invalid.
+  void set_surface_invalid() { was_painted_to_ = false; }
+ private:
+  // The manager of this accelerated surface container.
+  AcceleratedSurfaceContainerManagerMac* manager_;
+
+  // Whether this accelerated surface's content is supposed to be opaque.
+  bool opaque_;
+
+  // The IOSurfaceRef, if any, that has been handed from the GPU
+  // plugin process back to the browser process for drawing.
+  // This is held as a CFTypeRef because we can't refer to the
+  // IOSurfaceRef type when building on 10.5.
+  base::mac::ScopedCFTypeRef<CFTypeRef> surface_;
+
+  // The id of |surface_|, or 0 if |surface_| is NULL.
+  uint64 surface_id_;
+
+  // The width and height of the io surface. During resizing, this is different
+  // from |width_| and |height_|.
+  int32 surface_width_;
+  int32 surface_height_;
+
+  // The TransportDIB which is used in pre-10.6 systems where the IOSurface
+  // API is not supported.  This is a weak reference to the actual TransportDIB
+  // whic is owned by the GPU process.
+  scoped_ptr<TransportDIB> transport_dib_;
+
+  // The width and height of the container.
+  int32 width_;
+  int32 height_;
+
+  // The clip rectangle, relative to the (x_, y_) origin.
+  gfx::Rect clip_rect_;
+
+  // The "live" OpenGL texture referring to this IOSurfaceRef. Note
+  // that per the CGLTexImageIOSurface2D API we do not need to
+  // explicitly update this texture's contents once created. All we
+  // need to do is ensure it is re-bound before attempting to draw
+  // with it.
+  GLuint texture_;
+
+  // True if we need to upload the texture again during the next draw.
+  bool texture_needs_upload_;
+
+  // This may refer to an old version of the texture if the container is
+  // resized, for example.
+  GLuint texture_pending_deletion_;
+
+  // Stores if the plugin has a visible state.
+  bool visible_;
+
+  // Stores if the plugin's IOSurface has been swapped before. Used to not show
+  // it before it hasn't been painted to at least once.
+  bool was_painted_to_;
+
+  // Releases the IOSurface reference, if any, retained by this object.
+  void ReleaseIOSurface();
+
+  // Enqueue our texture for later deletion.
+  void EnqueueTextureForDeletion();
+
+  DISALLOW_COPY_AND_ASSIGN(AcceleratedSurfaceContainerMac);
+};
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_GPU_PLUGIN_CONTAINER_MAC_H_