Add UMA metrics for ICE regathering reasons.

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.
  */
 
 #ifndef WEBRTC_P2P_BASE_TRANSPORTCONTROLLER_H_
 #define WEBRTC_P2P_BASE_TRANSPORTCONTROLLER_H_
 
 #include <map>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "webrtc/base/asyncinvoker.h"
 #include "webrtc/base/sigslot.h"
 #include "webrtc/base/sslstreamadapter.h"
 #include "webrtc/p2p/base/candidate.h"
 #include "webrtc/p2p/base/transport.h"
 
 namespace rtc {
 class Thread;
 }
+namespace webrtc {
+class MetricsObserverInterface;
+}
 
 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,
@@ skipping 84 matching lines @@
   sigslot::signal2<const std::string&, const Candidates&>
       SignalCandidatesGathered;
 
   sigslot::signal1<const Candidates&> SignalCandidatesRemoved;
 
   // for unit test
   const rtc::scoped_refptr<rtc::RTCCertificate>& certificate_for_testing();
 
   sigslot::signal1<rtc::SSLHandshakeError> SignalDtlsHandshakeError;
 
+  void SetMetricsObserver(webrtc::MetricsObserverInterface* metrics_observer);
+
  protected:
   // Protected and virtual so we can override it in unit tests.
   virtual Transport* CreateTransport_n(const std::string& transport_name);
 
   // For unit tests
   const std::map<std::string, Transport*>& transports() { return transports_; }
   Transport* GetTransport_n(const std::string& transport_name);
 
  private:
   void OnMessage(rtc::Message* pmsg) override;
@@ skipping 89 matching lines @@
 
   // 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;
+
+  webrtc::MetricsObserverInterface* metrics_observer_ = nullptr;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_TRANSPORTCONTROLLER_H_