Adds an iOS implementation of gfx::Image.

ui/gfx/image/image_unittest_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.
 
 // Because the unit tests for gfx::Image are spread across multiple
 // implementation files, this header contains the reusable components.
 
 #ifndef UI_GFX_IMAGE_IMAGE_UNITTEST_UTIL_H_
 #define UI_GFX_IMAGE_IMAGE_UNITTEST_UTIL_H_
 
 #include "ui/gfx/image/image.h"
 #include "third_party/skia/include/core/SkColor.h"
 
 namespace gfx {
 namespace test {
 
-#if defined(OS_MACOSX)
+#if defined(OS_IOS)
+typedef UIImage* PlatformImage;
+#elif defined(OS_MACOSX)
 typedef NSImage* PlatformImage;
 #elif defined(TOOLKIT_GTK)
 typedef GdkPixbuf* PlatformImage;
 #else
 typedef const SkBitmap PlatformImage;
 #endif
 
 void SetSupportedScaleFactorsTo1xAnd2x();
 
 const SkBitmap CreateBitmap(int width, int height);
@@ skipping 17 matching lines @@
 void CheckColor(SkColor color, bool is_red);
 
 bool IsPlatformImageValid(PlatformImage image);
 
 bool PlatformImagesEqual(PlatformImage image1, PlatformImage image2);
 
 }  // namespace test
 }  // namespace gfx
 
 #endif  // UI_GFX_IMAGE_IMAGE_UNITTEST_UTIL_H_