[GCM] Add ConnectionListener support, and hook up to debug page

google_apis/gcm/engine/connection_factory_impl.h

Index: google_apis/gcm/engine/connection_factory_impl.h
diff --git a/google_apis/gcm/engine/connection_factory_impl.h b/google_apis/gcm/engine/connection_factory_impl.h
index b52ef2dc8688ec765993032774d47c920c95e987..31cecf688414bca0514d6a7c6bc3a22bcef79278 100644
--- a/google_apis/gcm/engine/connection_factory_impl.h
+++ b/google_apis/gcm/engine/connection_factory_impl.h
@@ -48,8 +48,10 @@ class GCM_EXPORT ConnectionFactoryImpl :
   virtual ConnectionHandler* GetConnectionHandler() const OVERRIDE;
   virtual void Connect() OVERRIDE;
   virtual bool IsEndpointReachable() const OVERRIDE;
+  virtual std::string GetConnectionStateString() const OVERRIDE;
   virtual base::TimeTicks NextRetryAttempt() const OVERRIDE;
   virtual void SignalConnectionReset(ConnectionResetReason reason) OVERRIDE;
+  virtual void SetConnectionListener(ConnectionListener* listener) OVERRIDE;
 
   // NetworkChangeNotifier observer implementations.
   virtual void OnConnectionTypeChanged(
@@ -61,6 +63,10 @@ class GCM_EXPORT ConnectionFactoryImpl :
   // attempt will be made.
   GURL GetCurrentEndpoint() const;
 
+  // Returns the IPEndpoint to which the factory is currently connected. If no
+  // connection is active, returns an empty IPEndpoint.
+  net::IPEndPoint GetPeerIP();
+
  protected:
   // Implementation of Connect(..). If not in backoff, uses |login_request_|
   // in attempting a connection/handshake. On connection/handshake failure, goes
@@ -161,6 +167,9 @@ class GCM_EXPORT ConnectionFactoryImpl :
   // Recorder that records GCM activities for debugging purpose. Not owned.
   GCMStatsRecorder* recorder_;
 
+  // Listener for connection change events.
+  ConnectionListener* listener_;
+
   base::WeakPtrFactory<ConnectionFactoryImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ConnectionFactoryImpl);