Lazy initialization for PushMessagingEventRouter

chrome/browser/extensions/api/push_messaging/push_messaging_api.h

Index: chrome/browser/extensions/api/push_messaging/push_messaging_api.h
diff --git a/chrome/browser/extensions/api/push_messaging/push_messaging_api.h b/chrome/browser/extensions/api/push_messaging/push_messaging_api.h
index dc9c7cb9426d879da4154e82b9f099dcbdead4e4..68488c04d8c18687388ae485c8667c0165134ff8 100644
--- a/chrome/browser/extensions/api/push_messaging/push_messaging_api.h
+++ b/chrome/browser/extensions/api/push_messaging/push_messaging_api.h
@@ -13,7 +13,9 @@
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/extensions/api/push_messaging/obfuscated_gaia_id_fetcher.h"
 #include "chrome/browser/extensions/api/push_messaging/push_messaging_invalidation_handler_delegate.h"
+#include "chrome/browser/extensions/event_router.h"
 #include "chrome/browser/extensions/extension_function.h"
+#include "chrome/browser/profiles/profile_keyed_service.h"
 #include "chrome/browser/ui/webui/signin/login_ui_service.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
@@ -34,8 +36,6 @@ class PushMessagingEventRouter
   explicit PushMessagingEventRouter(Profile* profile);
   virtual ~PushMessagingEventRouter();
 
-  void Shutdown();
-
   PushMessagingInvalidationMapper* GetMapperForTest() const {
     return handler_.get();
   }
@@ -104,6 +104,36 @@ class PushMessagingGetChannelIdFunction
   DISALLOW_COPY_AND_ASSIGN(PushMessagingGetChannelIdFunction);
 };
 
+class PushMessagingAPI : public ProfileKeyedService,
+                         public extensions::EventRouter::Observer {
+ public:
+  explicit PushMessagingAPI(Profile* profile);
+  virtual ~PushMessagingAPI();
+
+  // Convenience method to get the PushMessagingAPI for a profile.
+  static PushMessagingAPI* Get(Profile* profile);
+
+  // ProfileKeyedService implementation.
+  virtual void Shutdown() OVERRIDE;
+
+  // EventRouter::Observer implementation.
+  virtual void OnListenerAdded(const extensions::EventListenerInfo& details)
+      OVERRIDE;
+
+  // For testing purposes.
+  void InitializeEventRouterForTest();
+  PushMessagingEventRouter* GetEventRouterForTest();
+
+ private:
+  void InitializeEventRouter();
+
+  Profile* const profile_;
+  // Created in OnListenerAdded.
+  scoped_ptr<PushMessagingEventRouter> push_messaging_event_router_;
+
+  DISALLOW_COPY_AND_ASSIGN(PushMessagingAPI);
+};
+
 }  // namespace extension
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_PUSH_MESSAGING_PUSH_MESSAGING_API_H__