Implement framesEncoded stat in 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 73e98cffb795e3182fd6c2c8030111261ed91b96..84a315683791887254e3a86282e21dd648672343 100644
--- a/webrtc/video/send_statistics_proxy_unittest.cc
+++ b/webrtc/video/send_statistics_proxy_unittest.cc
@@ -301,6 +301,16 @@ TEST_F(SendStatisticsProxyTest, OnEncoderReconfiguredChangePreferredBitrate) {
   EXPECT_EQ(kPreferredMediaBitrateBps, stats.preferred_media_bitrate_bps);
 }
 
+TEST_F(SendStatisticsProxyTest, OnSendEncodedImageIncreasesFramesEncoded) {
+  EncodedImage encoded_image;
+  CodecSpecificInfo codec_info;
+  EXPECT_EQ(0, statistics_proxy_->GetStats().frames_encoded);
+  for (int i = 1; i <= 3; ++i) {
+    statistics_proxy_->OnSendEncodedImage(encoded_image, &codec_info);
+    EXPECT_EQ(i, statistics_proxy_->GetStats().frames_encoded);
+  }
+}
+
 TEST_F(SendStatisticsProxyTest, SwitchContentTypeUpdatesHistograms) {
   const int kWidth = 640;
   const int kHeight = 480;