Reland of Verify sender ssrc when receiving rtcp target bitrate

webrtc/modules/rtp_rtcp/source/rtcp_receiver_unittest.cc

Index: webrtc/modules/rtp_rtcp/source/rtcp_receiver_unittest.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_receiver_unittest.cc b/webrtc/modules/rtp_rtcp/source/rtcp_receiver_unittest.cc
index 3ad333c6b9575270141d65c9813777228ec4aba3..d42a74e6a10d41ddd9b6cb418e7c531c521d8488 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_receiver_unittest.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_receiver_unittest.cc
@@ -1225,6 +1225,15 @@
   rtcp::ExtendedReports xr;
   xr.SetTargetBitrate(bitrate);
 
+  // Wrong sender ssrc, target bitrate should be discarded.
+  xr.SetSenderSsrc(kSenderSsrc + 1);
+  EXPECT_CALL(bitrate_allocation_observer_,
+              OnBitrateAllocationUpdated(expected_allocation))
+      .Times(0);
+  InjectRtcpPacket(xr);
+
+  // Set correct ssrc, callback should be called once.
+  xr.SetSenderSsrc(kSenderSsrc);
   EXPECT_CALL(bitrate_allocation_observer_,
               OnBitrateAllocationUpdated(expected_allocation));
   InjectRtcpPacket(xr);
@@ -1241,6 +1250,7 @@
 
   rtcp::ExtendedReports xr;
   xr.SetTargetBitrate(bitrate);
+  xr.SetSenderSsrc(kSenderSsrc);
 
   EXPECT_CALL(bitrate_allocation_observer_,
               OnBitrateAllocationUpdated(expected_allocation));