Add support for multi resolution icons

ui/gfx/codec/tiff_codec_mac.mm

+// Copyright (c) 2011 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.
+
+#include "ui/gfx/codec/tiff_codec.h"
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/memory/scoped_nsobject.h"
+#include "skia/ext/skia_utils_mac.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+
+namespace gfx {
+
+bool TIFFCodec::Decode(const unsigned char* input, size_t input_size,
+                       std::vector<SkBitmap>& bitmaps) {
+  scoped_nsobject<NSData> data([[NSData alloc]
+      initWithBytesNoCopy:const_cast<unsigned char*>(input)
+                   length:input_size
+             freeWhenDone:NO]);
+  NSArray* image_reps = [NSBitmapImageRep imageRepsWithData:data];
+  if ([image_reps count] == 0)
+    return false;
+
+  for (NSBitmapImageRep* image_rep in image_reps) {
+    SkBitmap bitmap(NSImageRepToSkBitmap(image_rep, [image_rep size], false));
+    if (bitmap.isNull())
+      return false;
+    bitmaps.push_back(bitmap);
+  }
+
+  return true;
+}
+
+} // namespace gfx