In QUIC v39, read and write integers and floating numbers in big endian.

net/quic/core/quic_framer.h

Index: net/quic/core/quic_framer.h
diff --git a/net/quic/core/quic_framer.h b/net/quic/core/quic_framer.h
index c8e1ba2a0d5a5e7f6599d76692aec2a1c385753c..f244191f0384006746fa8b1a20eca6205b1d771f 100644
--- a/net/quic/core/quic_framer.h
+++ b/net/quic/core/quic_framer.h
@@ -12,6 +12,7 @@
 
 #include "base/macros.h"
 #include "net/quic/core/quic_packets.h"
+#include "net/quic/platform/api/quic_endian.h"
 #include "net/quic/platform/api/quic_export.h"
 #include "net/quic/platform/api/quic_string_piece.h"
 
@@ -320,6 +321,9 @@ class QUIC_EXPORT_PRIVATE QuicFramer {
     quic_version_ = versions[0];
   }
 
+  // Returns byte order to read/write integers and floating numbers.
+  Endianness endianness() const;
+
   void set_validate_flags(bool value) { validate_flags_ = value; }
 
   Perspective perspective() const { return perspective_; }