Add parameter to TransportController to not change ICE role on restart.

webrtc/p2p/base/transportcontroller.h

 /*
  *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 13 matching lines @@
 
 namespace rtc {
 class Thread;
 }
 
 namespace cricket {
 
 class TransportController : public sigslot::has_slots<>,
                             public rtc::MessageHandler {
  public:
+  // If |redetermine_role_on_ice_restart| is true, ICE role is redetermined
+  // upon setting a local transport description that indicates an ICE restart.
+  // For the constructor that doesn't take this parameter, it defaults to true.
+  TransportController(rtc::Thread* signaling_thread,
+                      rtc::Thread* network_thread,
+                      PortAllocator* port_allocator,
+                      bool redetermine_role_on_ice_restart);
+
   TransportController(rtc::Thread* signaling_thread,
                       rtc::Thread* network_thread,
                       PortAllocator* port_allocator);
 
   virtual ~TransportController();
 
   rtc::Thread* signaling_thread() const { return signaling_thread_; }
   rtc::Thread* network_thread() const { return network_thread_; }
 
   PortAllocator* port_allocator() const { return port_allocator_; }
@@ skipping 169 matching lines @@
   rtc::SSLProtocolVersion ssl_max_version_ = rtc::SSL_PROTOCOL_DTLS_12;
 
   // Aggregate state for TransportChannelImpls.
   IceConnectionState connection_state_ = kIceConnectionConnecting;
   bool receiving_ = false;
   IceGatheringState gathering_state_ = kIceGatheringNew;
 
   // TODO(deadbeef): Move the fields below down to the transports themselves
   IceConfig ice_config_;
   IceRole ice_role_ = ICEROLE_CONTROLLING;
+  bool redetermine_role_on_ice_restart_;
   uint64_t ice_tiebreaker_ = rtc::CreateRandomId64();
   rtc::scoped_refptr<rtc::RTCCertificate> certificate_;
   rtc::AsyncInvoker invoker_;
   // True if QUIC is used instead of DTLS.
   bool quic_ = false;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_TRANSPORTCONTROLLER_H_