Let QUIC_VERSION_38 support IETF PADDING frame (1 byte frame with type 0x00) and respect NSTP conne…

net/quic/core/quic_data_reader.cc

Index: net/quic/core/quic_data_reader.cc
diff --git a/net/quic/core/quic_data_reader.cc b/net/quic/core/quic_data_reader.cc
index 5f2c483338b349e30c36bade5560c222b637a4ee..2c2f9cd231300af530610e39c53830f5c1228ef1 100644
--- a/net/quic/core/quic_data_reader.cc
+++ b/net/quic/core/quic_data_reader.cc
@@ -7,6 +7,7 @@
 #include "net/base/int128.h"
 #include "net/quic/core/quic_flags.h"
 #include "net/quic/core/quic_packets.h"
+#include "net/quic/platform/api/quic_bug_tracker.h"
 #include "net/quic/platform/api/quic_endian.h"
 #include "net/quic/platform/api/quic_logging.h"
 
@@ -154,4 +155,13 @@ void QuicDataReader::OnFailure() {
   pos_ = len_;
 }
 
+uint8_t QuicDataReader::PeekByte() const {
+  if (pos_ >= len_) {
+    QUIC_BUG << "Reading is done, cannot peek next byte. Tried to read pos = "
+             << pos_ << " buffer length = " << len_;
+    return 0;
+  }
+  return data_[pos_];
+}
+
 }  // namespace net