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diff --git a/skia/ext/platform_canvas_mac.h b/skia/ext/platform_canvas_mac.h
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+// Copyright (c) 2006-2008 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 SKIA_EXT_PLATFORM_CANVAS_MAC_H_
+#define SKIA_EXT_PLATFORM_CANVAS_MAC_H_
+
+#include "skia/ext/platform_device_mac.h"
+
+#include "SkCanvas.h"
+
+namespace gfx {
+
+// This class is a specialization of the regular SkCanvas that is designed to
+// work with a gfx::PlatformDevice to manage platform-specific drawing. It
+// allows using both Skia operations and platform-specific operations.
+class PlatformCanvasMac : public SkCanvas {
+ public:
+  // Set is_opaque if you are going to erase the bitmap and not use
+  // tranparency: this will enable some optimizations.  The shared_section
+  // parameter is passed to gfx::PlatformDevice::create.  See it for details.
+  //
+  // If you use the version with no arguments, you MUST call initialize()
+  PlatformCanvasMac();
+  PlatformCanvasMac(int width, int height, bool is_opaque);
+  PlatformCanvasMac(int width, int height, bool is_opaque, CGContextRef context);
+  virtual ~PlatformCanvasMac();
+
+  // For two-part init, call if you use the no-argument constructor above
+  bool initialize(int width, int height, bool is_opaque);
+
+  // These calls should surround calls to platform drawing routines. The CG
+  // context returned by beginPlatformPaint is the one that can be used to
+  // draw into.
+  // Call endPlatformPaint when you are done and want to use Skia operations
+  // again; this will synchronize the bitmap.
+  virtual CGContextRef beginPlatformPaint();
+  virtual void endPlatformPaint();
+
+  // Returns the platform device pointer of the topmost rect with a non-empty
+  // clip. In practice, this is usually either the top layer or nothing, since
+  // we usually set the clip to new layers when we make them.
+  //
+  // If there is no layer that is not all clipped out, this will return a
+  // dummy device so callers do not have to check. If you are concerned about
+  // performance, check the clip before doing any painting.
+  //
+  // This is different than SkCanvas' getDevice, because that returns the
+  // bottommost device.
+  //
+  // Danger: the resulting device should not be saved. It will be invalidated
+  // by the next call to save() or restore().
+  PlatformDeviceMac& getTopPlatformDevice() const;
+
+  // Allow callers to see the non-virtual function even though we have an
+  // override of a virtual one.
+  using SkCanvas::clipRect;
+
+ protected:
+  // Creates a device store for use by the canvas. We override this so that
+  // the device is always our own so we know that we can use GDI operations
+  // on it. Simply calls into createPlatformDevice().
+  virtual SkDevice* createDevice(SkBitmap::Config, int width, int height,
+                                 bool is_opaque, bool isForLayer);
+
+  // Creates a device store for use by the canvas. By default, it creates a
+  // BitmapPlatformDevice object. Can be overridden to change the object type.
+  virtual SkDevice* createPlatformDevice(int width, int height, bool is_opaque,
+                                         CGContextRef context);
+
+ private:
+  // Unimplemented. This is to try to prevent people from calling this function
+  // on SkCanvas. SkCanvas' version is not virtual, so we can't prevent this
+  // 100%, but hopefully this will make people notice and not use the function.
+  // Calling SkCanvas' version will create a new device which is not compatible
+  // with us and we will crash if somebody tries to draw into it with
+  // CoreGraphics.
+  SkDevice* setBitmapDevice(const SkBitmap& bitmap);
+
+  // Disallow copy and assign.
+  PlatformCanvasMac(const PlatformCanvasMac&);
+  PlatformCanvasMac& operator=(const PlatformCanvasMac&);
+};
+
+}  // namespace gfx
+
+#endif  // SKIA_EXT_PLATFORM_CANVAS_MAC_H_
+