Convert tabs, windows, and extension APIs to feature system.

chrome/browser/extensions/extension_event_router.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_EVENT_ROUTER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_EVENT_ROUTER_H_
 #pragma once
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
+#include "chrome/common/extensions/feature.h"
 #include "ipc/ipc_message.h"
 
 class GURL;
 class Extension;
 class ExtensionHost;
 class ExtensionDevToolsManager;
 class Profile;
 
+using extensions::Feature;
+
 namespace content {
 class RenderProcessHost;
 }
 
 class ExtensionEventRouter : public content::NotificationObserver {
  public:
   // These constants convey the state of our knowledge of whether we're in
   // a user-caused gesture as part of DispatchEvent.
   enum UserGestureState {
     USER_GESTURE_UNKNOWN = 0,
@@ skipping 11 matching lines @@
                             UserGestureState user_gesture);
 
   explicit ExtensionEventRouter(Profile* profile);
   virtual ~ExtensionEventRouter();
 
   // Add or remove the process/extension pair as a listener for |event_name|.
   // Note that multiple extensions can share a process due to process
   // collapsing. Also, a single extension can have 2 processes if it is a split
   // mode extension.
   void AddEventListener(const std::string& event_name,
+                        const std::string& extension_id,
                         content::RenderProcessHost* process,
-                        const std::string& extension_id);
+                        Feature::Context context);
   void RemoveEventListener(const std::string& event_name,
                            content::RenderProcessHost* process,
                            const std::string& extension_id);
 
   // Add or remove the extension as having a lazy background page that listens
   // to the event. The difference from the above methods is that these will be
   // remembered even after the process goes away. We use this list to decide
   // which extension pages to load when dispatching an event.
   void AddLazyEventListener(const std::string& event_name,
+                            const std::string& extension_id,
+                            content::RenderProcessHost* process,
+                            Feature::Context context);
+  // Use this overload when subscribing extensions to events from C++, or when
+  // access checking the calling process and context is not required.
+  void AddLazyEventListener(const std::string& event_name,
                             const std::string& extension_id);
   void RemoveLazyEventListener(const std::string& event_name,
                                const std::string& extension_id);
 
   // Returns true if there is at least one listener for the given event.
   bool HasEventListener(const std::string& event_name);
 
   // Returns true if the extension is listening to the given event.
   bool ExtensionHasEventListener(const std::string& extension_id,
                                  const std::string& event_name);
@@ skipping 46 matching lines @@
   void OnExtensionEventAck(Profile* profile, const std::string& extension_id);
 
  private:
   // The details of an event to be dispatched.
   struct ExtensionEvent;
 
   // The extension and process that contains the event listener for a given
   // event.
   struct ListenerProcess;
 
+  // Helper that returns whether the event is accessible to the calling context.
+  bool IsEventAvailable(const std::string& event_name,
+                        const std::string& extension_id,
+                        content::RenderProcessHost* render_process,
+                        Feature::Context context_type) const;
+
   // A map between an event name and a set of extensions that are listening
   // to that event.
   typedef std::map<std::string, std::set<ListenerProcess> > ListenerMap;
 
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // Returns true if the given listener map contains a event listeners for
   // the given event. If |extension_id| is non-empty, we also check that that
@@ skipping 56 matching lines @@
 
   // The list of all the lazy (non-persistent) background pages that are
   // listening to events. This is just a cache of the real list, which is
   // stored on disk in the extension prefs.
   ListenerMap lazy_listeners_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionEventRouter);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_EVENT_ROUTER_H_