[filebrowser] Show progress indication, while files from GData are being downloaded.

chrome/browser/chromeos/extensions/file_browser_event_router.cc

 // 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 "chrome/browser/chromeos/extensions/file_browser_event_router.h"
 
 #include "base/bind.h"
 #include "base/json/json_writer.h"
 #include "base/message_loop.h"
 #include "base/stl_util.h"
@@ skipping 222 matching lines @@
 }
 
 void FileBrowserEventRouter::HandleProgressUpdateForExtensionAPI(
     const std::vector<gdata::GDataOperationRegistry::ProgressStatus>& list) {
   scoped_ptr<ListValue> event_list(
       file_manager_util::ProgressStatusVectorToListValue(
           profile_,
           file_manager_util::GetFileBrowserExtensionUrl().GetOrigin(),
           list));
 
+  ListValue args;
+  args.Append(event_list.release());
+
   std::string args_json;
-  base::JSONWriter::Write(event_list.get(),
+  base::JSONWriter::Write(&args,
                           &args_json);
 
   profile_->GetExtensionEventRouter()->DispatchEventToExtension(
       std::string(kFileBrowserDomain),
       extension_event_names::kOnFileTransfersUpdated, args_json,
       NULL, GURL());
 }
 
 void FileBrowserEventRouter::HandleProgressUpdateForSystemNotification(
     const std::vector<gdata::GDataOperationRegistry::ProgressStatus>& list) {
@@ skipping 363 matching lines @@
   return scoped_refptr<RefcountedProfileKeyedService>(
       new FileBrowserEventRouter(profile));
 }
 
 bool FileBrowserEventRouterFactory::ServiceHasOwnInstanceInIncognito() {
   // Explicitly and always allow this router in guest login mode.   see
   // chrome/browser/profiles/profile_keyed_base_factory.h comment
   // for the details.
   return true;
 }