Let ViEEncoder handle resolution changes.

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 593c93b8e1aa859150ceacc39408a20e5c1a64e2..f43eeb566432a7fdf422c5fce3f9fedfda817db4 100644
--- a/webrtc/video/send_statistics_proxy_unittest.cc
+++ b/webrtc/video/send_statistics_proxy_unittest.cc
@@ -295,13 +295,16 @@ TEST_F(SendStatisticsProxyTest, SwitchContentTypeUpdatesHistograms) {
   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);
+  // No switch, stats should not be updated.
+  VideoEncoderConfig config;
+  config.content_type = VideoEncoderConfig::ContentType::kRealtimeVideo;
+  std::vector<VideoStream> video_streams;
+  statistics_proxy_->OnEncoderReconfigured(config, video_streams);
   EXPECT_EQ(0, metrics::NumSamples("WebRTC.Video.InputWidthInPixels"));
 
   // Switch to screenshare, real-time stats should be updated.
-  statistics_proxy_->SetContentType(VideoEncoderConfig::ContentType::kScreen);
+  config.content_type = VideoEncoderConfig::ContentType::kScreen;
+  statistics_proxy_->OnEncoderReconfigured(config, video_streams);
   EXPECT_EQ(1, metrics::NumSamples("WebRTC.Video.InputWidthInPixels"));
 }
 
@@ -538,7 +541,10 @@ TEST_F(SendStatisticsProxyTest, ResetsRtcpCountersOnContentChange) {
   proxy->RtcpPacketTypesCounterUpdated(kSecondSsrc, counters);
 
   // Changing content type causes histograms to be reported.
-  statistics_proxy_->SetContentType(VideoEncoderConfig::ContentType::kScreen);
+  VideoEncoderConfig config;
+  config.content_type = VideoEncoderConfig::ContentType::kScreen;
+  std::vector<VideoStream> video_streams;
+  statistics_proxy_->OnEncoderReconfigured(config, video_streams);
 
   EXPECT_EQ(1,
             metrics::NumSamples("WebRTC.Video.NackPacketsReceivedPerMinute"));
@@ -633,7 +639,10 @@ TEST_F(SendStatisticsProxyTest, ResetsRtpCountersOnContentChange) {
   proxy->DataCountersUpdated(rtx_counters, kSecondRtxSsrc);
 
   // Changing content type causes histograms to be reported.
-  statistics_proxy_->SetContentType(VideoEncoderConfig::ContentType::kScreen);
+  VideoEncoderConfig config;
+  config.content_type = VideoEncoderConfig::ContentType::kScreen;
+  std::vector<VideoStream> video_streams;
+  statistics_proxy_->OnEncoderReconfigured(config, video_streams);
 
   EXPECT_EQ(1, metrics::NumSamples("WebRTC.Video.BitrateSentInKbps"));
   EXPECT_EQ(1,