Adds an iOS implementation of gfx::Image.

ui/gfx/image/image_util_ios.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.
+
+#include <UIKit/UIKit.h>
+
+#include "ui/gfx/image/image.h"
+#include "ui/gfx/image/image_util.h"
+
+#include "base/logging.h"
+
+namespace gfx {
+
+bool JPEGEncodedDataFromImage(const Image& image,
+                              int quality,
+                              std::vector<unsigned char>* dst) {
+  NSData* data = UIImageJPEGRepresentation(image.ToUIImage(), quality / 100.0);
+
+  if ([data length] == 0)
+    return false;
+
+  dst->resize([data length]);
+  [data getBytes:&dst->at(0) length:[data length]];
+  return true;
+}
+
+}  // end namespace gfx