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

google_apis/gcm/engine/fake_connection_factory.cc

Index: google_apis/gcm/engine/fake_connection_factory.cc
diff --git a/google_apis/gcm/engine/fake_connection_factory.cc b/google_apis/gcm/engine/fake_connection_factory.cc
index 88bbc51be530031a84eef0b0fb5d5aaf5ba54d2e..51447b9e5a8abaf4210d9ff8872bc726f31c7123 100644
--- a/google_apis/gcm/engine/fake_connection_factory.cc
+++ b/google_apis/gcm/engine/fake_connection_factory.cc
@@ -41,6 +41,10 @@ bool FakeConnectionFactory::IsEndpointReachable() const {
   return connection_handler_.get() && connection_handler_->CanSendMessage();
 }
 
+std::string FakeConnectionFactory::GetConnectionStateString() const {
+  return "";
+}
+
 base::TimeTicks FakeConnectionFactory::NextRetryAttempt() const {
   return base::TimeTicks();
 }
@@ -53,4 +57,8 @@ void FakeConnectionFactory::SignalConnectionReset(
     reconnect_pending_ = true;
 }
 
+void FakeConnectionFactory::SetConnectionListener(
+    ConnectionListener* listener) {
+}
+
 }  // namespace gcm