Convert extension action icons code to use ImageSkia instead of SkBitmap

ui/gfx/image/image_skia_operations.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_IMAGE_SKIA_OPERATIONS_H_
 #define UI_GFX_IMAGE_SKIA_OPERATIONS_H_
 
 #include "base/gtest_prod_util.h"
 #include "ui/base/ui_export.h"
 #include "ui/gfx/color_utils.h"
 #include "ui/gfx/shadow_value.h"
 
 namespace gfx {
 class ImageSkia;
 class Rect;
 class Size;
 
 class UI_EXPORT ImageSkiaOperations {
  public:
   // Create an image that is a blend of two others. The alpha argument
   // specifies the opacity of the second imag. The provided image must
   // use the kARGB_8888_Config config and be of equal dimensions.
   static ImageSkia CreateBlendedImage(const ImageSkia& first,
                                       const ImageSkia& second,
                                       double alpha);
 
+  // Creates new image by painting first and second image respectively.
+  // The second image is centered in respect to the first image.

[Jeffrey Yasskin, 2012/08/09 21:39:04]

I've seen code that wants to control whether centered images round up or down
when they can't be exactly centered. Do you want to expose that here?

[tbarzic, 2012/08/10 06:24:08]

might be a good idea, but I'd leave it outside of scope of this change..

[Jeffrey Yasskin, 2012/08/10 07:40:35]

SGTM.

+  static ImageSkia CreateSuperimposedImage(const ImageSkia& first,
+                                           const ImageSkia& second);
+
   // Create an image that is the original image masked out by the mask defined
   // in the alpha image. The images must use the kARGB_8888_Config config and
   // be of equal dimensions.
   static ImageSkia CreateMaskedImage(const ImageSkia& first,
                                      const ImageSkia& alpha);
 
   // Create an image that is cropped from another image. This is special
   // because it tiles the original image, so your coordinates can extend
   // outside the bounds of the original image.
   static ImageSkia CreateTiledImage(const ImageSkia& image,
@@ skipping 40 matching lines @@
   static ImageSkia CreateImageWithDropShadow(const ImageSkia& source,
                                              const ShadowValues& shadows);
 
  private:
   ImageSkiaOperations();  // Class for scoping only.
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_IMAGE_IMAGE_SKIA_OPERATIONS_H_