Introduce an "ExtensionWantsToAct" method

chrome/browser/extensions/active_script_controller.h

 // Copyright 2014 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_ACTIVE_SCRIPT_CONTROLLER_H_
 #define CHROME_BROWSER_EXTENSIONS_ACTIVE_SCRIPT_CONTROLLER_H_
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/scoped_observer.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "extensions/browser/extension_registry_observer.h"
 #include "extensions/common/permissions/permissions_data.h"
 #include "extensions/common/user_script.h"
 
 namespace content {
+class BrowserContext;
 class WebContents;
 }
 
 namespace IPC {
 class Message;
 }
 
 class ExtensionAction;
 
 namespace extensions {
@@ skipping 69 matching lines @@
 
   // Handle the RequestScriptInjectionPermission message.
   void OnRequestScriptInjectionPermission(
       const std::string& extension_id,
       UserScript::InjectionType script_type,
       int64 request_id);
 
   // Grants permission for the given request to run.
   void PermitScriptInjection(int64 request_id);
 
+  // Notifies the ExtensionActionAPI of a change (either that an extension now
+  // wants permission to run, or that it has been run).
+  void NotifyChange(const Extension* extension);
+
   // Log metrics.
   void LogUMA() const;
 
   // content::WebContentsObserver implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual void DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) OVERRIDE;
 
   // ExtensionRegistryObserver:
   virtual void OnExtensionUnloaded(
       content::BrowserContext* browser_context,
       const Extension* extension,
       UnloadedExtensionInfo::Reason reason) OVERRIDE;
 
+  // The associated browser context.
+  content::BrowserContext* browser_context_;
+
   // Whether or not the ActiveScriptController is enabled (corresponding to the
   // kActiveScriptEnforcement switch). If it is not, it acts as an empty shell,
   // always allowing scripts to run and never displaying actions.
   bool enabled_;
 
   // The map of extension_id:pending_request of all pending requests.
   PendingRequestMap pending_requests_;
 
   // The extensions which have been granted permission to run on the given page.
   // TODO(rdevlin.cronin): Right now, this just keeps track of extensions that
   // have been permitted to run on the page via this interface. Instead, it
   // should incorporate more fully with ActiveTab.
   std::set<std::string> permitted_extensions_;
 
   ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
       extension_registry_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ActiveScriptController);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_ACTIVE_SCRIPT_CONTROLLER_H_