[Panels] Provide a tab id for web contents in Panels.

chrome/browser/ui/panels/panel_host.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/ui/panels/panel_host.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "chrome/browser/chrome_page_zoom.h"
 #include "chrome/browser/extensions/window_controller.h"
 #include "chrome/browser/favicon/favicon_tab_helper.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/sessions/session_tab_helper.h"
 #include "chrome/browser/ui/browser_navigator.h"
 #include "chrome/browser/ui/panels/panel.h"
 #include "chrome/browser/ui/prefs/prefs_tab_helper.h"
 #include "chrome/browser/ui/tab_contents/tab_contents.h"
 #include "chrome/browser/view_type_utils.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/extensions/extension_messages.h"
 #include "content/public/browser/invalidate_type.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/notification_service.h"
@@ skipping 25 matching lines @@
   if (url.is_empty())
     return;
 
   web_contents_.reset(content::WebContents::Create(
       profile_, content::SiteInstance::CreateForURL(profile_, url),
       MSG_ROUTING_NONE, NULL));
   chrome::SetViewType(web_contents_.get(), chrome::VIEW_TYPE_PANEL);
   web_contents_->SetDelegate(this);
   content::WebContentsObserver::Observe(web_contents_.get());
 
+  // Needed to give the web contents a Tab ID. Extension APIs
+  // expect web contents to have a Tab ID.
+  SessionTabHelper::CreateForWebContents(web_contents_.get());
+  SessionTabHelper::FromWebContents(web_contents_.get())->SetWindowID(
+      panel_->session_id());
+
   favicon_tab_helper_.reset(new FaviconTabHelper(web_contents_.get()));
   prefs_tab_helper_.reset(new PrefsTabHelper(web_contents_.get()));
 
   web_contents_->GetController().LoadURL(
       url, content::Referrer(), content::PAGE_TRANSITION_LINK, std::string());
 }
 
 void PanelHost::DestroyWebContents() {
   favicon_tab_helper_.reset();
   prefs_tab_helper_.reset();
@@ skipping 177 matching lines @@
 }
 
 void PanelHost::StopLoading() {
   content::RecordAction(UserMetricsAction("Stop"));
   web_contents_->Stop();
 }
 
 void PanelHost::Zoom(content::PageZoom zoom) {
   chrome_page_zoom::Zoom(web_contents_.get(), zoom);
 }