Modified the rtp_receiver_unittests.

webrtc/api/rtpreceiverinterface.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 37 matching lines @@
   // The identifier of the source can be the CSRC or the SSRC.
   uint32_t source_id() const { return source_id_; }
 
   // The source can be either a contributing source or a synchronization source.
   RtpSourceType source_type() const { return source_type_; }
 
   // This isn't implemented yet and will always return an empty Optional.
   // TODO(zhihuang): Implement this to return real audio level.
   rtc::Optional<int8_t> audio_level() const { return rtc::Optional<int8_t>(); }
 
+  bool operator==(const RtpSource& o) const {
+    return timestamp_ms_ == o.timestamp_ms() && source_id_ == o.source_id() &&
+           source_type_ == o.source_type();
+  }
+
  private:
   int64_t timestamp_ms_;
   uint32_t source_id_;
   RtpSourceType source_type_;
 };
 
 class RtpReceiverObserverInterface {
  public:
   // Note: Currently if there are multiple RtpReceivers of the same media type,
   // they will all call OnFirstPacketReceived at once.
@@ skipping 50 matching lines @@
   PROXY_CONSTMETHOD0(std::string, id)
   PROXY_CONSTMETHOD0(RtpParameters, GetParameters);
   PROXY_METHOD1(bool, SetParameters, const RtpParameters&)
   PROXY_METHOD1(void, SetObserver, RtpReceiverObserverInterface*);
   PROXY_CONSTMETHOD0(std::vector<RtpSource>, GetSources);
   END_PROXY_MAP()
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_RTPRECEIVERINTERFACE_H_