Fix for stats updated twice when switching content type.

webrtc/video/send_statistics_proxy_unittest.cc

Index: webrtc/video/send_statistics_proxy_unittest.cc
diff --git a/webrtc/video/send_statistics_proxy_unittest.cc b/webrtc/video/send_statistics_proxy_unittest.cc
index f098ce2d239e309bc23ee64dc55429f572cdbcab..fc1f3fdbdea1ad3a287198aaf259af4c9e655273 100644
--- a/webrtc/video/send_statistics_proxy_unittest.cc
+++ b/webrtc/video/send_statistics_proxy_unittest.cc
@@ -16,6 +16,7 @@
 #include <vector>
 
 #include "testing/gtest/include/gtest/gtest.h"
+#include "webrtc/test/histogram.h"
 
 namespace webrtc {
 
@@ -296,6 +297,25 @@ TEST_F(SendStatisticsProxyTest, OnEncodedFrame) {
   EXPECT_EQ(kEncodeTimeMs, stats.avg_encode_time_ms);
 }
 
+TEST_F(SendStatisticsProxyTest, SwitchContentTypeUpdatesHistograms) {
+  test::ClearHistograms();
+  const int kMinRequiredSamples = 200;
+  const int kWidth = 640;
+  const int kHeight = 480;
+
+  for (int i = 0; i < kMinRequiredSamples; ++i)
+    statistics_proxy_->OnIncomingFrame(kWidth, kHeight);
+
+  // No switch, stats not should be updated.
+  statistics_proxy_->SetContentType(
+      VideoEncoderConfig::ContentType::kRealtimeVideo);
+  EXPECT_EQ(0, test::NumHistogramSamples("WebRTC.Video.InputWidthInPixels"));
+
+  // Switch to screenshare, real-time stats should be updated.
+  statistics_proxy_->SetContentType(VideoEncoderConfig::ContentType::kScreen);
+  EXPECT_EQ(1, test::NumHistogramSamples("WebRTC.Video.InputWidthInPixels"));
+}
+
 TEST_F(SendStatisticsProxyTest, NoSubstreams) {
   uint32_t excluded_ssrc =
       std::max(