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diff --git a/skia/ext/platform_device_mac.h b/skia/ext/platform_device_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_DEVICE_MAC_H_
+#define SKIA_EXT_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;
+
+  // 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;
+
+  // On platforms where the native rendering API does not support rendering
+  // into bitmaps with a premultiplied alpha channel, this call is responsible
+  // for doing any fixup necessary.  It is not used on the Mac, since
+  // CoreGraphics can handle premultiplied alpha just fine.
+  virtual void fixupAlphaBeforeCompositing() = 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);
+
+  // Loads a SkRegion into the CG context.
+  static void LoadClippingRegionToCGContext(CGContextRef context,
+                                            const SkRegion& region,
+                                            const SkMatrix& transformation);
+
+ 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  // SKIA_EXT_PLATFORM_DEVICE_MAC_H_
+