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diff --git a/base/gfx/platform_device_mac.h b/base/gfx/platform_device_mac.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef BASE_GFX_PLATFORM_DEVICE_MAC_H__
+#define BASE_GFX_PLATFORM_DEVICE_MAC_H__
+
+#import <ApplicationServices/ApplicationServices.h>
+#include "SkDevice.h"
+
+class SkMatrix;
+class SkPath;
+class SkRegion;
+
+namespace gfx {
+
+// A device is basically a wrapper around SkBitmap that provides a surface for
+// SkCanvas to draw into. Our device provides a surface CoreGraphics can also
+// write to. It also provides functionality to play well with CG drawing
+// functions.
+// This class is abstract and must be subclassed. It provides the basic
+// interface to implement it either with or without a bitmap backend.
+class PlatformDeviceMac : public SkDevice {
+ public:
+  // The CGContext that corresponds to the bitmap, used for CoreGraphics
+  // operations drawing into the bitmap. This is possibly heavyweight, so it
+  // should exist only during one pass of rendering.
+  virtual CGContextRef GetBitmapContext() = 0;
+
+  // Translate the device's coordinate system by the given amount; this will
+  // override any previous calls to this function.
+  virtual void SetTransform(const SkMatrix& matrix) = 0;
+
+  // Devices may be in a layer and offset from the root device. In this case,
+  // the transform (set by setTransform) will corrspond to the root device, and
+  // this device will actually be offset from there.
+  //
+  // This is called after a layered device is created to tell us the location.
+  // This location will be factored into any transforms applied via
+  // setTransform.
+  //
+  // If this function is not called, the offset defaults to (0, 0);
+  virtual void SetDeviceOffset(int x, int y) = 0;
+
+  // Sets the clipping region, overriding any previous calls.
+  virtual void SetClipRegion(const SkRegion& region) = 0;
+
+  // Draws to the given graphics context. If the bitmap context doesn't exist,
+  // this will temporarily create it. However, if you have created the bitmap
+  // context, it will be more efficient if you don't free it until after this
+  // call so it doesn't have to be created twice.  If src_rect is null, then
+  // the entirety of the source device will be copied.
+  virtual void DrawToContext(CGContextRef context, int x, int y,
+                             const CGRect* src_rect) = 0;
+
+  // Sets the opacity of each pixel in the specified region to be opaque.
+  void makeOpaque(int x, int y, int width, int height);
+
+  // Returns if the preferred rendering engine is vectorial or bitmap based.
+  virtual bool IsVectorial() = 0;
+
+  // Initializes the default settings and colors in a device context.
+  static void InitializeCGContext(CGContextRef context);
+
+  // Loads a SkPath into the CG context. The path can there after be used for
+  // clipping or as a stroke.
+  static void LoadPathToCGContext(CGContextRef context, const SkPath& path);
+
+ protected:
+  // Forwards |bitmap| to SkDevice's constructor.
+  PlatformDeviceMac(const SkBitmap& bitmap);
+
+  // Loads the specified Skia transform into the device context
+  static void LoadTransformToCGContext(CGContextRef context,
+                                       const SkMatrix& matrix);
+
+  // Function pointer used by the processPixels method for setting the alpha
+  // value of a particular pixel.
+  typedef void (*adjustAlpha)(uint32_t* pixel);
+  
+  // Loops through each of the pixels in the specified range, invoking
+  // adjustor for the alpha value of each pixel.
+  virtual void processPixels(int x,
+                             int y,
+                             int width,
+                             int height,
+                             adjustAlpha adjustor) = 0;
+};
+
+}  // namespace gfx
+
+#endif  // BASE_GFX_PLATFORM_DEVICE_MAC_H__