Eliminate all UI thread decoding of extension images....

chrome/browser/extensions/extension_dom_ui.cc

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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/extensions/extension_dom_ui.h"
 
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "net/base/file_stream.h"
 #include "base/string_util.h"
 #include "chrome/browser/browser.h"
@@ skipping 312 matching lines @@
   // Even when the extensions service is enabled by default, it's still
   // disabled in incognito mode.
   ExtensionsService* service = profile->GetExtensionsService();
   if (!service)
     return NULL;
 
   Extension* extension = service->GetExtensionByURL(page_url);
   if (!extension)
     return NULL;
 
-  return ReadFileData(
-      extension->GetIconPath(Extension::EXTENSION_ICON_BITTY).GetFilePath());
+  // TODO(arv): Move this off of the UI thread and onto the File thread. If
+  //            possible to do this asynchronously, use ImageLoadingTracker.
+  return ReadFileData(extension->GetIconPath(
+      Extension::EXTENSION_ICON_BITTY).GetFilePath());
 }