Implement new page action API.

chrome/browser/tab_contents/tab_contents.h

 // Copyright (c) 2009 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_TAB_CONTENTS_TAB_CONTENTS_H_
 #define CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 
 #include "build/build_config.h"
 
 #include <map>
@@ skipping 251 matching lines @@
   void SetPageActionEnabled(const ExtensionAction* page_action, bool enable,
                             const std::string& title, int icon_id);
 
   // Returns the page action state for this tab. The pair returns contains
   // the title (string) for the page action and the icon index to use (int).
   // If this function returns NULL it means the page action is not enabled for
   // this tab.
   const ExtensionActionState* GetPageActionState(
       const ExtensionAction* page_action);
 
+  // Same as above, but creates an enable state if it doesn't exist. The return
+  // value can be updated. The caller should call PageActionStateChanged when
+  // done modifying the state.
+  ExtensionActionState* GetOrCreatePageActionState(
+      const ExtensionAction* page_action);
+
+  // Call this after updating a ExtensionActionState object returned by
+  // GetOrCreatePageActionState to notify clients about the changes.
+  void PageActionStateChanged();
+
   // Whether the tab is in the process of being destroyed.
   // Added as a tentative work-around for focus related bug #4633.  This allows
   // us not to store focus when a tab is being closed.
   bool is_being_destroyed() const { return is_being_destroyed_; }
 
   // Convenience method for notifying the delegate of a navigation state
   // change. See TabContentsDelegate.
   void NotifyNavigationStateChanged(unsigned changed_flags);
 
   // Invoked when the tab contents becomes selected. If you override, be sure
@@ skipping 822 matching lines @@
   // Keeps track of the last search string that was used to search in any tab.
   string16* last_search_prepopulate_text_;
 
   // The last find result. This object contains details about the number of
   // matches, the find selection rectangle, etc. The UI can access this
   // information to build its presentation.
   FindNotificationDetails last_search_result_;
 
   // Data for Page Actions -----------------------------------------------------
 
-  // A map of page actions that are enabled in this tab (and a state object
-  // that can be used to override the title and icon used for the page action).
-  // This map is cleared every time the mainframe navigates and populated by the
-  // PageAction extension API.
-  std::map< const ExtensionAction*, linked_ptr<ExtensionActionState> >
-      enabled_page_actions_;
+  // A map of page actions that this tab knows about (and a state object that
+  // can be used to update the title, icon, visibilty, etc used for the page
+  // action). This map is cleared every time the mainframe navigates and
+  // populated by the PageAction extension API.
+  typedef std::map< const ExtensionAction*, linked_ptr<ExtensionActionState> >
+      PageActionStateMap;
+  PageActionStateMap page_actions_;
 
   // Data for misc internal state ----------------------------------------------
 
   // See capturing_contents() above.
   bool capturing_contents_;
 
   // See getter above.
   bool is_being_destroyed_;
 
   // Indicates whether we should notify about disconnection of this
@@ skipping 41 matching lines @@
 
   // The time that we started to close the tab.
   base::TimeTicks tab_close_start_time_;
 
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(TabContents);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_