Take 2 at implementing activeTab.

chrome/browser/extensions/extension_tab_helper.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_TAB_HELPER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_TAB_HELPER_H_
 #pragma once
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
+#include "chrome/browser/extensions/active_tab_permission_manager.h"
 #include "chrome/browser/extensions/app_notify_channel_setup.h"
 #include "chrome/browser/extensions/extension_function_dispatcher.h"
 #include "chrome/browser/extensions/image_loading_tracker.h"
 #include "chrome/browser/extensions/webstore_inline_installer.h"
 #include "chrome/common/web_apps.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 class ExtensionTabHelperDelegate;
 class TabContents;
@@ skipping 29 matching lines @@
   void set_delegate(ExtensionTabHelperDelegate* d) { delegate_ = d; }
 
   // Call this after updating a page action to notify clients about the changes.
   void PageActionStateChanged();
 
   // Requests application info for the specified page. This is an asynchronous
   // request. The delegate is notified by way of OnDidGetApplicationInfo when
   // the data is available.
   void GetApplicationInfo(int32 page_id);
 
+  // Gets the ID of the tab.
+  int tab_id() const;
+
+  // Gets the window ID of the tab.
+  int window_id() const;
+
   // App extensions ------------------------------------------------------------
 
   // Sets the extension denoting this as an app. If |extension| is non-null this
   // tab becomes an app-tab. WebContents does not listen for unload events for
   // the extension. It's up to consumers of WebContents to do that.
   //
   // NOTE: this should only be manipulated before the tab is added to a browser.
   // TODO(sky): resolve if this is the right way to identify an app tab. If it
   // is, than this should be passed in the constructor.
   void SetExtensionApp(const extensions::Extension* extension);
@@ skipping 24 matching lines @@
   }
 
   content::WebContents* web_contents() const {
     return content::WebContentsObserver::web_contents();
   }
 
   extensions::ScriptExecutor* script_executor();
 
   extensions::LocationBarController* location_bar_controller();
 
+  extensions::ActiveTabPermissionManager* active_tab_permission_manager() {
+    return &active_tab_permission_manager_;
+  }
+
   // Sets a non-extension app icon associated with WebContents and fires an
   // INVALIDATE_TYPE_TITLE navigation state change to trigger repaint of title.
   void SetAppIcon(const SkBitmap& app_icon);
 
  private:
   // content::WebContentsObserver overrides.
+  virtual void RenderViewCreated(
+      content::RenderViewHost* render_view_host) OVERRIDE;
   virtual void DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // ExtensionFunctionDispatcher::Delegate overrides.
   virtual ExtensionWindowController* GetExtensionWindowController()
       const OVERRIDE;
   virtual content::WebContents* GetAssociatedWebContents() const OVERRIDE;
 
@@ skipping 68 matching lines @@
 
   TabContents* tab_contents_;
 
   // Either script_executor/location_bar_controller will have values, or
   // script_badge_controller will have a value, depending on whether the action
   // box is turned on.
   scoped_ptr<extensions::ScriptExecutor> script_executor_;
   scoped_ptr<extensions::LocationBarController> location_bar_controller_;
   scoped_refptr<extensions::ScriptBadgeController> script_badge_controller_;
 
+  extensions::ActiveTabPermissionManager active_tab_permission_manager_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionTabHelper);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TAB_HELPER_H_