Introduce an "ExtensionWantsToAct" method

chrome/browser/extensions/api/extension_action/extension_action_api.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_API_EXTENSION_ACTION_EXTENSION_ACTION_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_EXTENSION_ACTION_EXTENSION_ACTION_API_H_
 
 #include <string>
 
 #include "base/observer_list.h"
@@ skipping 73 matching lines @@
       bool grant_active_tab_permissions);
 
   // Opens the popup for the given |extension| in the given |browser|'s window.
   // If |grant_active_tab_permissions| is true, this grants the extension
   // activeTab (so this should only be done if this is through a direct user
   // action).
   bool ShowExtensionActionPopup(const Extension* extension,
                                 Browser* browser,
                                 bool grant_active_tab_permissions);
 
+  // Returns true if the given |extension| wants to run on the tab pointed to
+  // by |web_contents|.
+  bool ExtensionWantsToRun(const Extension* extension,
+                           content::WebContents* web_contents);
+
   // Notifies that there has been a change in the given |extension_action|.
   void NotifyChange(ExtensionAction* extension_action,
                     content::WebContents* web_contents,
                     content::BrowserContext* browser_context);
 
   // Clears the values for all ExtensionActions for the tab associated with the
   // given |web_contents| (and signals that page actions changed).
   void ClearAllValuesForTab(content::WebContents* web_contents);
 
   // Notifies that the current set of page actions for |web_contents| has
@@ skipping 333 matching lines @@
 class PageActionGetPopupFunction
     : public extensions::ExtensionActionGetPopupFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("pageAction.getPopup", PAGEACTION_GETPOPUP)
 
  protected:
   virtual ~PageActionGetPopupFunction() {}
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_EXTENSION_ACTION_EXTENSION_ACTION_API_H_