Add support for PNG representation in gfx::Image

chrome/browser/ui/tests/ui_gfx_image_unittest.mm

 // 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.
 
 #import <AppKit/AppKit.h>
 
 #include "base/memory/scoped_nsobject.h"
 #import "chrome/browser/ui/cocoa/cocoa_test_helper.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkBitmap.h"
@@ skipping 12 matching lines @@
   [image unlockFocus];
 
   // SkBitmapToNSImage returns a bitmap in the calibrated color space (sRGB),
   // while NSReadPixel returns a color in the device color space. Convert back
   // to the calibrated color space before testing.
   color = [color colorUsingColorSpaceName:NSCalibratedRGBColorSpace];
 
   CGFloat components[4] = { 0 };
   [color getComponents:components];
 
-  EXPECT_GT(components[0], 0.95);
-  EXPECT_LT(components[1], 0.05);
+  EXPECT_LT(components[0], 0.05);
+  EXPECT_GT(components[1], 0.95);
   EXPECT_LT(components[2], 0.05);
   EXPECT_GT(components[3], 0.95);
 }
 
 TEST_F(UiGfxImageTest, ImageView) {
   scoped_nsobject<NSImageView> image_view(
       [[NSImageView alloc] initWithFrame:NSMakeRect(10, 10, 25, 25)]);
   [[test_window() contentView] addSubview:image_view];
   [test_window() orderFront:nil];
 
   gfx::Image image(gfx::test::CreateBitmap(25, 25));
   [image_view setImage:image.ToNSImage()];
 }
 
 }  // namespace