Fix login visual hitch on chromebook

chrome/browser/profiles/profile_downloader.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright (c) 2013 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 "chrome/browser/profiles/profile_downloader.h"
 
 #include <string>
 #include <vector>
 
 #include "base/json/json_reader.h"
 #include "base/logging.h"
@@ skipping 318 matching lines @@
                                          net::LOAD_DO_NOT_SAVE_COOKIES);
     if (!auth_token_.empty()) {
       profile_image_fetcher_->SetExtraRequestHeaders(
           base::StringPrintf(kAuthorizationHeader, auth_token_.c_str()));
     }
     profile_image_fetcher_->Start();
   } else if (source == profile_image_fetcher_.get()) {
     VLOG(1) << "Decoding the image...";
     scoped_refptr<ImageDecoder> image_decoder = new ImageDecoder(
         this, data, ImageDecoder::DEFAULT_CODEC);
-    image_decoder->Start();
+    scoped_refptr<base::MessageLoopProxy> task_runner =
+        BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI);
+    image_decoder->Start(task_runner);
   }
 }
 
 void ProfileDownloader::OnImageDecoded(const ImageDecoder* decoder,
                                        const SkBitmap& decoded_image) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   int image_size = delegate_->GetDesiredImageSideLength();
   profile_picture_ = skia::ImageOperations::Resize(
       decoded_image,
       skia::ImageOperations::RESIZE_BEST,
@@ skipping 42 matching lines @@
   auth_token_ = access_token;
   StartFetchingImage();
 }
 
 // Callback for OAuth2AccessTokenFetcher on failure.
 void ProfileDownloader::OnGetTokenFailure(const GoogleServiceAuthError& error) {
   LOG(WARNING) << "ProfileDownloader: token request using refresh token failed";
   delegate_->OnProfileDownloadFailure(
       this, ProfileDownloaderDelegate::TOKEN_ERROR);
 }