Make it possible to keep the port allocator session running

webrtc/p2p/client/fakeportallocator.h

Index: webrtc/p2p/client/fakeportallocator.h
diff --git a/webrtc/p2p/client/fakeportallocator.h b/webrtc/p2p/client/fakeportallocator.h
index 9e53bc04aaae061db0886b047471443e89af9971..95894a4c06be209c7c8bebb362743dc4caed5602 100644
--- a/webrtc/p2p/client/fakeportallocator.h
+++ b/webrtc/p2p/client/fakeportallocator.h
@@ -61,8 +61,11 @@ class FakePortAllocatorSession : public PortAllocatorSession {
     running_ = true;
   }
 
-  virtual void StopGettingPorts() { running_ = false; }
+  virtual void StopGettingPorts(bool keep_session_running) {
+    running_ = keep_session_running;
+  }
   virtual bool IsGettingPorts() { return running_; }
+
   int port_config_count() { return port_config_count_; }
 
   void AddPort(cricket::Port* port) {