ui/gfx: Add MapRect and ExtractScale skia helper functions.

ui/gfx/skia_util.h

 // Copyright (c) 2012 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 UI_GFX_SKIA_UTIL_H_
 #define UI_GFX_SKIA_UTIL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 70 matching lines @@
 
 // Returns true if the two bitmaps contain the same pixels.
 GFX_EXPORT bool BitmapsAreEqual(const SkBitmap& bitmap1,
                                 const SkBitmap& bitmap2);
 
 // Converts Skia ARGB format pixels in |skia| to RGBA.
 GFX_EXPORT void ConvertSkiaToRGBA(const unsigned char* skia,
                                   int pixel_width,
                                   unsigned char* rgba);
 
+// Extracts the scale component from the matrix. Returns true if it succeeded
+// and false otherwise.
+GFX_EXPORT bool ExtractScale(const SkMatrix& matrix, SkSize* scale);
+
+// Applies the matrix to the rect and returns the resulting rect.
+GFX_EXPORT SkRect MapRect(const SkMatrix& matrix, const SkRect& src);
+
 }  // namespace gfx
 
 #endif  // UI_GFX_SKIA_UTIL_H_