Added support for multiple parameters to Extension API callbacks.

chrome/browser/extensions/api/offscreen_tabs/offscreen_tabs_api.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/extensions/api/offscreen_tabs/offscreen_tabs_api.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/hash_tables.h"
@@ skipping 495 matching lines @@
     parent_tab = new ParentTab();
     parent_tab->Init(web_contents, extension_id());
   }
 
   const OffscreenTab& offscreen_tab = GetMap()->CreateOffscreenTab(
       parent_tab, url, width, height, extension_id());
 
   // TODO(alexbost): Maybe the callback is called too soon. It should probably
   // be called once we have navigated to the url.
   if (has_callback()) {
-    result_.reset(offscreen_tab.CreateValue());
+    SetResult(offscreen_tab.CreateValue());
     SendResponse(true);
   }
 
   return true;
 }
 
 GetOffscreenTabFunction::GetOffscreenTabFunction() {}
 GetOffscreenTabFunction::~GetOffscreenTabFunction() {}
 
 bool GetOffscreenTabFunction::RunImpl() {
   int offscreen_tab_id;
   EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(0, &offscreen_tab_id));
 
   OffscreenTab* offscreen_tab = NULL;
   if (!GetMap()->GetOffscreenTab(
           offscreen_tab_id, this, &offscreen_tab, &error_)) {
     error_ = ExtensionErrorUtils::FormatErrorMessage(
         keys::kOffscreenTabNotFoundError, base::IntToString(offscreen_tab_id));
     return false;
   }
 
-  result_.reset(offscreen_tab->CreateValue());
+  SetResult(offscreen_tab->CreateValue());
   return true;
 }
 
 GetAllOffscreenTabFunction::GetAllOffscreenTabFunction() {}
 GetAllOffscreenTabFunction::~GetAllOffscreenTabFunction() {}
 
 bool GetAllOffscreenTabFunction::RunImpl() {
   WebContents* web_contents = GetCurrentWebContents(this, &error_);
   if (!web_contents)
     return false;
 
   ParentTab* parent_tab = GetMap()->GetParentTab(web_contents, extension_id());
   ListValue* tab_list = new ListValue();
   if (parent_tab) {
     for (OffscreenTabs::const_iterator i = parent_tab->offscreen_tabs().begin();
          i != parent_tab->offscreen_tabs().end(); ++i)
       tab_list->Append((*i)->CreateValue());
   }
 
-  result_.reset(tab_list);
+  SetResult(tab_list);
   return true;
 }
 
 RemoveOffscreenTabFunction::RemoveOffscreenTabFunction() {}
 RemoveOffscreenTabFunction::~RemoveOffscreenTabFunction() {}
 
 bool RemoveOffscreenTabFunction::RunImpl() {
   int offscreen_tab_id;
   EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(0, &offscreen_tab_id));
 
@@ skipping 263 matching lines @@
   // async case (when a "javascript": URL is sent to a tab).
   if (!is_async)
     SendResponse(true);
 
   return true;
 }
 
 void UpdateOffscreenTabFunction::PopulateResult() {
   // There's no result associated with this callback.
 }