Report framedrops outside libvpx to QualityScaler.

webrtc/modules/video_coding/codecs/vp8/vp8_impl.cc

Index: webrtc/modules/video_coding/codecs/vp8/vp8_impl.cc
diff --git a/webrtc/modules/video_coding/codecs/vp8/vp8_impl.cc b/webrtc/modules/video_coding/codecs/vp8/vp8_impl.cc
index f035568355d1f042d9ecc086936f50cedb0c4246..4c9a37cbf863aedb51054ef64b689a7857a6e203 100644
--- a/webrtc/modules/video_coding/codecs/vp8/vp8_impl.cc
+++ b/webrtc/modules/video_coding/codecs/vp8/vp8_impl.cc
@@ -306,6 +306,11 @@ int VP8EncoderImpl::SetRates(uint32_t new_bitrate_kbit,
   return WEBRTC_VIDEO_CODEC_OK;
 }
 
+void VP8EncoderImpl::OnDroppedFrame() {
+  if (quality_scaler_enabled_)
+    quality_scaler_.ReportDroppedFrame();
+}
+
 const char* VP8EncoderImpl::ImplementationName() const {
   return "libvpx";
 }