[Panels refactor] Track Panels in TaskManager now that they are not under the tab contents umbrella.

chrome/browser/ui/panels/panel.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_UI_PANELS_PANEL_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_H_
 
 #include <string>
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/property_bag.h"
 #include "base/string16.h"
 #include "chrome/browser/command_updater.h"
 #include "chrome/browser/sessions/session_id.h"
 #include "chrome/browser/ui/base_window.h"
 #include "chrome/browser/ui/panels/panel_constants.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "ui/gfx/rect.h"
 
 class Browser;
@@ skipping 40 matching lines @@
     // differently to attract the user's attention. This is the default mode.
     USE_PANEL_ATTENTION = 0x01,
     // Uses the system attention. On Windows or Linux (depending on Window
     // Manager), the app icon on taskbar will be flashed. On MacOS, the dock
     // icon will jump once.
     USE_SYSTEM_ATTENTION = 0x02
   };
 
   virtual ~Panel();
 
+  // Helper to retrieve the existing instance that owns a given WebContents.
+  // Returns NULL if there is no such existing instance.
+  // NOTE: This is not intended for general use. It is intended for situations
+  // like callbacks from content, where only a WebContents is available. In the
+  // general case, please do NOT use this; plumb Panels through the chrome/
+  // code instead of WebContents.
+  static Panel* FromWebContents(content::WebContents* contents);
+
   // Returns the PanelManager associated with this panel.
   PanelManager* manager() const;
 
   const std::string& app_name() const { return app_name_; }
   const SessionID& session_id() const { return session_id_; }
   ExtensionWindowController* extension_window_controller() const {
     return extension_window_controller_.get();
   }
   const std::string extension_id() const;
 
@@ skipping 221 matching lines @@
   // provide a title. For extensions, this is usually the application name
   // generated from the extension id.
   Panel(const std::string& app_name,
         const gfx::Size& min_size, const gfx::Size& max_size);
 
  private:
   friend class PanelManager;
   friend class PanelBrowserTest;
   friend class OldPanelBrowserTest;
 
+  // Used to retrieve this object from the web_contents, which is placed in
+  // the web contents property bag to avoid adding additional interfaces.
+  static base::PropertyAccessor<Panel*>* property_accessor();
+
   enum MaxSizePolicy {
     // Default maximum size is proportional to the work area.
     DEFAULT_MAX_SIZE,
     // Custom maximum size is used when the panel is resized by the user.
     CUSTOM_MAX_SIZE
   };
 
   // Initialize state for all supported commands.
   void InitCommandState();
 
@@ skipping 52 matching lines @@
 
   content::NotificationRegistrar registrar_;
   const SessionID session_id_;
   scoped_ptr<ExtensionWindowController> extension_window_controller_;
   scoped_ptr<PanelHost> panel_host_;
 
   DISALLOW_COPY_AND_ASSIGN(Panel);
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_H_