Add a helper to resource bundle to get an NSImage back....

app/resource_bundle_mac.mm

 // Copyright (c) 2006-2008 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 "app/resource_bundle.h"
 
 #import <Foundation/Foundation.h>
 
 #include "app/gfx/font.h"
 #include "app/l10n_util.h"
 #include "base/base_paths.h"
 #include "base/data_pack.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/mac_util.h"
 #include "base/path_service.h"
 #include "base/string_piece.h"
 #include "base/string_util.h"
+#include "skia/ext/skia_utils_mac.h"
 
 ResourceBundle::~ResourceBundle() {
   FreeImages();
 
   delete locale_resources_data_;
   locale_resources_data_ = NULL;
   delete theme_data_;
   theme_data_ = NULL;
   delete resources_data_;
   resources_data_ = NULL;
@@ skipping 79 matching lines @@
       NOTREACHED() << "unable to find resource: " << message_id;
       return string16();
     }
   }
 
   // Data pack encodes strings as UTF16.
   string16 msg(reinterpret_cast<const char16*>(data.data()),
                data.length() / 2);
   return msg;
 }
+
+NSImage* ResourceBundle::GetNSImageNamed(int resource_id) {
+  // Currently this doesn't make a cache holding these as NSImages because
+  // GetBitmapNamed has a cache, and we don't want to double cache.
+  SkBitmap* bitmap = GetBitmapNamed(resource_id);
+  if (!bitmap)
+    return nil;
+
+  NSImage* nsimage = gfx::SkBitmapToNSImage(*bitmap);
+  return nsimage;
+}