Add histogram for end-to-end delay.

webrtc/video/receive_statistics_proxy.h

Index: webrtc/video/receive_statistics_proxy.h
diff --git a/webrtc/video/receive_statistics_proxy.h b/webrtc/video/receive_statistics_proxy.h
index 09c5f122e897737ed348821638b8d104ff5605df..4c6caf0daa0cba927108ab5d39733bc04c590d82 100644
--- a/webrtc/video/receive_statistics_proxy.h
+++ b/webrtc/video/receive_statistics_proxy.h
@@ -45,7 +45,7 @@ class ReceiveStatisticsProxy : public VCMReceiveStatisticsCallback,
 
   void OnDecodedFrame();
   void OnSyncOffsetUpdated(int64_t sync_offset_ms);
-  void OnRenderedFrame(int width, int height);
+  void OnRenderedFrame(const VideoFrame& frame);
   void OnIncomingPayloadType(int payload_type);
   void OnDecoderImplementationName(const char* implementation_name);
   void OnIncomingRate(unsigned int framerate, unsigned int bitrate_bps);
@@ -120,6 +120,7 @@ class ReceiveStatisticsProxy : public VCMReceiveStatisticsCallback,
   SampleCounter target_delay_counter_ GUARDED_BY(crit_);
   SampleCounter current_delay_counter_ GUARDED_BY(crit_);
   SampleCounter delay_counter_ GUARDED_BY(crit_);
+  SampleCounter e2e_delay_counter_ GUARDED_BY(crit_);
   ReportBlockStats report_block_stats_ GUARDED_BY(crit_);
   QpCounters qp_counters_;  // Only accessed on the decoding thread.
   std::map<uint32_t, StreamDataCounters> rtx_stats_ GUARDED_BY(crit_);