Implement qpSum stat for video send ssrc stats.

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 cb3bde442647856fab6cea7b41e575148105b45e..d8eaf3342ee526e49f57b2a25bb50b223f32c5d5 100644
--- a/webrtc/video/send_statistics_proxy_unittest.cc
+++ b/webrtc/video/send_statistics_proxy_unittest.cc
@@ -311,6 +311,28 @@ TEST_F(SendStatisticsProxyTest, OnSendEncodedImageIncreasesFramesEncoded) {
   }
 }
 
+TEST_F(SendStatisticsProxyTest, OnSendEncodedImageIncreasesQpSum) {
+  EncodedImage encoded_image;
+  CodecSpecificInfo codec_info;
+  EXPECT_EQ(rtc::Optional<uint64_t>(), statistics_proxy_->GetStats().qp_sum);
+  encoded_image.qp_ = 3;
+  statistics_proxy_->OnSendEncodedImage(encoded_image, &codec_info);
+  EXPECT_EQ(rtc::Optional<uint64_t>(3u), statistics_proxy_->GetStats().qp_sum);
+  encoded_image.qp_ = 127;
+  statistics_proxy_->OnSendEncodedImage(encoded_image, &codec_info);
+  EXPECT_EQ(rtc::Optional<uint64_t>(130u),
+            statistics_proxy_->GetStats().qp_sum);
+}
+
+TEST_F(SendStatisticsProxyTest, OnSendEncodedImageWithoutQpQpSumWontExist) {
+  EncodedImage encoded_image;
+  CodecSpecificInfo codec_info;
+  encoded_image.qp_ = -1;
+  EXPECT_EQ(rtc::Optional<uint64_t>(), statistics_proxy_->GetStats().qp_sum);
+  statistics_proxy_->OnSendEncodedImage(encoded_image, &codec_info);
+  EXPECT_EQ(rtc::Optional<uint64_t>(), statistics_proxy_->GetStats().qp_sum);
+}
+
 TEST_F(SendStatisticsProxyTest, SwitchContentTypeUpdatesHistograms) {
   const int kWidth = 640;
   const int kHeight = 480;