Add histogram for end-to-end delay.

webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc

Index: webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
diff --git a/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc b/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
index f6eaf0257b63be86937c75b0edbc087c26ca9f4d..aa54bdf0a5ecfcaef50cda07241db2f421dac0f2 100644
--- a/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
+++ b/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
@@ -931,14 +931,16 @@ int VP9DecoderImpl::Decode(const EncodedImage& input_image,
   // It may be released by libvpx during future vpx_codec_decode or
   // vpx_codec_destroy calls.
   img = vpx_codec_get_frame(decoder_, &iter);
-  int ret = ReturnFrame(img, input_image._timeStamp);
+  int ret = ReturnFrame(img, input_image._timeStamp, input_image.ntp_time_ms_);
   if (ret != 0) {
     return ret;
   }
   return WEBRTC_VIDEO_CODEC_OK;
 }
 
-int VP9DecoderImpl::ReturnFrame(const vpx_image_t* img, uint32_t timestamp) {
+int VP9DecoderImpl::ReturnFrame(const vpx_image_t* img,
+                                uint32_t timestamp,
+                                int64_t ntp_time_ms) {
   if (img == NULL) {
     // Decoder OK and NULL image => No show frame.
     return WEBRTC_VIDEO_CODEC_NO_OUTPUT;
@@ -964,6 +966,7 @@ int VP9DecoderImpl::ReturnFrame(const vpx_image_t* img, uint32_t timestamp) {
 
   VideoFrame decoded_image(img_wrapped_buffer, timestamp,
                            0 /* render_time_ms */, webrtc::kVideoRotation_0);
+  decoded_image.set_ntp_time_ms(ntp_time_ms);
 
   int ret = decode_complete_callback_->Decoded(decoded_image);
   if (ret != 0)