Add a new histogram Net.QuicSession.HeadersStreamEarlyFramesReceived

net/quic/reliable_quic_stream.cc

Index: net/quic/reliable_quic_stream.cc
diff --git a/net/quic/reliable_quic_stream.cc b/net/quic/reliable_quic_stream.cc
index 379991e82264e7c006f40fafb3de5b25af9ef9ba..8f34cf5e796a3bac75481456dcdfbfcdfc84f00b 100644
--- a/net/quic/reliable_quic_stream.cc
+++ b/net/quic/reliable_quic_stream.cc
@@ -181,6 +181,10 @@ int ReliableQuicStream::num_frames_received() const {
   return sequencer_.num_frames_received();
 }
 
+int ReliableQuicStream::num_early_frames_received() const {
+  return sequencer_.num_early_frames_received();
+}
+
 int ReliableQuicStream::num_duplicate_frames_received() const {
   return sequencer_.num_duplicate_frames_received();
 }