Report a more specific QUIC error when reading from the socket fails.

net/quic/quic_protocol.h

Index: net/quic/quic_protocol.h
diff --git a/net/quic/quic_protocol.h b/net/quic/quic_protocol.h
index bd478ff53aa553be941903be8799581b31a54860..b4438277820b5a0b279346783329d315d6297748 100644
--- a/net/quic/quic_protocol.h
+++ b/net/quic/quic_protocol.h
@@ -350,8 +350,10 @@ enum QuicErrorCode {
   QUIC_CONNECTION_TIMED_OUT = 25,
   // There was an error encountered migrating addresses
   QUIC_ERROR_MIGRATING_ADDRESS = 26,
-  // There was an error while writing the packet.
+  // There was an error while writing to the socket.
   QUIC_PACKET_WRITE_ERROR = 27,
+  // There was an error while reading from the socket.
+  QUIC_PACKET_READ_ERROR = 51,
 
 
   // Crypto errors.
@@ -398,7 +400,7 @@ enum QuicErrorCode {
   QUIC_CRYPTO_SERVER_CONFIG_EXPIRED = 45,
 
   // No error. Used as bound while iterating.
-  QUIC_LAST_ERROR = 49,
+  QUIC_LAST_ERROR = 52,
 };
 
 struct NET_EXPORT_PRIVATE QuicPacketPublicHeader {