Add platform_canvas_unittest.cc

base/gfx/skia_utils_mac.h

 // 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 BASE_GFX_SKIA_UTILS_MAC_H__
 #define BASE_GFX_SKIA_UTILS_MAC_H__
 
 #include "SkColor.h"
 #include <CoreGraphics/CGColor.h>
 
+struct SkMatrix;
 struct SkIRect;
 struct SkPoint;
 struct SkRect;
 
 namespace gfx {
 
 // Converts a Skia point to a CoreGraphics CGPoint.
 // Both use same in-memory format.
 inline const CGPoint& SkPointToCGPoint(const SkPoint& point) {
   return reinterpret_cast<const CGPoint&>(point);
 }
 
 // Converts a CoreGraphics point to a Skia CGPoint.
 // Both use same in-memory format.
 inline const SkPoint& CGPointToSkPoint(const CGPoint& point) {
   return reinterpret_cast<const SkPoint&>(point);
 }
+
+// Matrix converters.
+CGAffineTransform SkMatrixToCGAffineTransform(const SkMatrix& matrix);
   
 // Rectangle converters.
 SkRect CGRectToSkRect(const CGRect& rect);
 SkIRect CGRectToSkIRect(const CGRect& rect);
 
 // Converts a Skia rect to a CoreGraphics CGRect.
 CGRect SkIRectToCGRect(const SkIRect& rect);
 CGRect SkRectToCGRect(const SkRect& rect);
 
 // Converts CGColorRef to the ARGB layout Skia expects.
 SkColor CGColorRefToSkColor(CGColorRef color);
 
 // Converts ARGB to CGColorRef.
 CGColorRef SkColorToCGColorRef(SkColor color);
 
 }  // namespace gfx
 
 #endif