Reland the CL to remove candidates when doing continual gathering

webrtc/api/peerconnectioninterface.h

 /*
  *  Copyright 2012 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 421 matching lines @@
     return false;
   }
   // Provides a remote candidate to the ICE Agent.
   // A copy of the |candidate| will be created and added to the remote
   // description. So the caller of this method still has the ownership of the
   // |candidate|.
   // TODO(ronghuawu): Consider to change this so that the AddIceCandidate will
   // take the ownership of the |candidate|.
   virtual bool AddIceCandidate(const IceCandidateInterface* candidate) = 0;
 
+  // Removes a group of remote candidates from the ICE agent.
+  virtual bool RemoveIceCandidates(
+      const std::vector<cricket::Candidate>& candidates) {
+    return false;
+  }
+
   virtual void RegisterUMAObserver(UMAObserver* observer) = 0;
 
   // Returns the current SignalingState.
   virtual SignalingState signaling_state() = 0;
 
   // TODO(bemasc): Remove ice_state when callers are changed to
   // IceConnection/GatheringState.
   // Returns the current IceState.
   virtual IceState ice_state() = 0;
   virtual IceConnectionState ice_connection_state() = 0;
@@ skipping 36 matching lines @@
   virtual void OnIceConnectionChange(
       PeerConnectionInterface::IceConnectionState new_state) = 0;
 
   // Called any time the IceGatheringState changes
   virtual void OnIceGatheringChange(
       PeerConnectionInterface::IceGatheringState new_state) = 0;
 
   // New Ice candidate have been found.
   virtual void OnIceCandidate(const IceCandidateInterface* candidate) = 0;
 
+  // Ice candidates have been removed.
+  // TODO(honghaiz): Make this a pure virtual method when all its subclasses
+  // implement it.
+  virtual void OnIceCandidatesRemoved(
+      const std::vector<cricket::Candidate>& candidates) {}
+
   // Called when the ICE connection receiving status changes.
   virtual void OnIceConnectionReceivingChange(bool receiving) {}
 
  protected:
   // Dtor protected as objects shouldn't be deleted via this interface.
   ~PeerConnectionObserver() {}
 };
 
 // PeerConnectionFactoryInterface is the factory interface use for creating
 // PeerConnection, MediaStream and media tracks.
@@ skipping 124 matching lines @@
 CreatePeerConnectionFactory(
     rtc::Thread* worker_thread,
     rtc::Thread* signaling_thread,
     AudioDeviceModule* default_adm,
     cricket::WebRtcVideoEncoderFactory* encoder_factory,
     cricket::WebRtcVideoDecoderFactory* decoder_factory);
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_PEERCONNECTIONINTERFACE_H_