Modify PeerConnection for end-to-end QuicDataChannel usage

webrtc/base/bytebuffer.h

Index: webrtc/base/bytebuffer.h
diff --git a/webrtc/base/bytebuffer.h b/webrtc/base/bytebuffer.h
index ad2e552ed6a8389fffffafa2670fa74b7a709a4e..53b36996e37c9dc1ad5bd06ca69cdfcfd0cea2b0 100644
--- a/webrtc/base/bytebuffer.h
+++ b/webrtc/base/bytebuffer.h
@@ -52,6 +52,7 @@ class ByteBuffer {
   bool ReadUInt24(uint32_t* val);
   bool ReadUInt32(uint32_t* val);
   bool ReadUInt64(uint64_t* val);
+  bool ReadVarint(uint64_t* val);
   bool ReadBytes(char* val, size_t len);
 
   // Appends next |len| bytes from the buffer to |val|. Returns false
@@ -65,6 +66,7 @@ class ByteBuffer {
   void WriteUInt24(uint32_t val);
   void WriteUInt32(uint32_t val);
   void WriteUInt64(uint64_t val);
+  void WriteVarint(uint64_t val);
   void WriteString(const std::string& val);
   void WriteBytes(const char* val, size_t len);