Implement googContentType GetStats metric reported on receive side.

webrtc/video/receive_statistics_proxy_unittest.cc

Index: webrtc/video/receive_statistics_proxy_unittest.cc
diff --git a/webrtc/video/receive_statistics_proxy_unittest.cc b/webrtc/video/receive_statistics_proxy_unittest.cc
index 528ef09c88003d42a65f8e997d9f689e7ea36644..c51e349cf8cc31157d6919a4017013eb321be01e 100644
--- a/webrtc/video/receive_statistics_proxy_unittest.cc
+++ b/webrtc/video/receive_statistics_proxy_unittest.cc
@@ -98,6 +98,16 @@ TEST_F(ReceiveStatisticsProxyTest, OnDecodedFrameIncreasesQpSum) {
             statistics_proxy_->GetStats().qp_sum);
 }
 
+TEST_F(ReceiveStatisticsProxyTest, ReportsContentType) {
+  EXPECT_EQ("realtime", statistics_proxy_->GetStats().content_type);
+  statistics_proxy_->OnDecodedFrame(rtc::Optional<uint8_t>(3u),
+                                      VideoContentType::SCREENSHARE);

[tommi, 2017/08/30 15:03:28]

indentation seems off. can you run git cl format?

[ilnik, 2017/08/30 15:30:24]

Done.

+  EXPECT_EQ("screen", statistics_proxy_->GetStats().content_type);
+  statistics_proxy_->OnDecodedFrame(rtc::Optional<uint8_t>(3u),
+                                        VideoContentType::UNSPECIFIED);
+  EXPECT_EQ("realtime", statistics_proxy_->GetStats().content_type);
+}
+
 TEST_F(ReceiveStatisticsProxyTest, ReportsMaxInterframeDelay) {
   const int64_t kInterframeDelayMs1 = 100;
   const int64_t kInterframeDelayMs2 = 200;