Add UMA for send bwe and pacer bitrate.

webrtc/video/end_to_end_tests.cc

Index: webrtc/video/end_to_end_tests.cc
diff --git a/webrtc/video/end_to_end_tests.cc b/webrtc/video/end_to_end_tests.cc
index 6ed3c4715fb12b991a3e3ed2150c45e9dbc3c7b2..84399bacb051ce80cbeeafe20d560b1c5b4c0d18 100644
--- a/webrtc/video/end_to_end_tests.cc
+++ b/webrtc/video/end_to_end_tests.cc
@@ -1944,6 +1944,7 @@ void EndToEndTest::VerifyHistogramStats(bool use_rtx, bool use_red) {
   RunBaseTest(&test, FakeNetworkPipe::Config());
 
   // Delete the call for Call stats to be reported.
+  sender_call_.reset();
   receiver_call_.reset();
 
   // Verify that stats have been updated once.
@@ -1952,6 +1953,9 @@ void EndToEndTest::VerifyHistogramStats(bool use_rtx, bool use_red) {
   EXPECT_EQ(1,
             test::NumHistogramSamples("WebRTC.Call.RtcpBitrateReceivedInBps"));
   EXPECT_EQ(1, test::NumHistogramSamples("WebRTC.Call.BitrateReceivedInKbps"));
+  EXPECT_EQ(
+      1, test::NumHistogramSamples("WebRTC.Call.EstimatedSendBitrateInKbps"));
+  EXPECT_EQ(1, test::NumHistogramSamples("WebRTC.Call.PacerBitrateInKbps"));
 
   EXPECT_EQ(1, test::NumHistogramSamples(
       "WebRTC.Video.NackPacketsSentPerMinute"));