Add QuicTransportChannel methods for QUIC streams

webrtc/p2p/quic/reliablequicstream.h

Index: webrtc/p2p/quic/reliablequicstream.h
diff --git a/webrtc/p2p/quic/reliablequicstream.h b/webrtc/p2p/quic/reliablequicstream.h
index 61d060f850b0ec723cc8f0ea8dbe18f0ebce609a..9493a3fcc184a4b650c540720c20e57bac08cffd 100644
--- a/webrtc/p2p/quic/reliablequicstream.h
+++ b/webrtc/p2p/quic/reliablequicstream.h
@@ -29,16 +29,23 @@ class ReliableQuicStream : public net::ReliableQuicStream,
   // ReliableQuicStream overrides.
   void OnDataAvailable() override;
   void OnClose() override;
+  void OnCanWrite() override;
 
   // Process decrypted data into encrypted QUIC packets, which get sent to the
   // QuicPacketWriter. rtc::SR_BLOCK is returned if the operation blocks instead
   // of writing, in which case the data is queued until OnCanWrite() is called.
-  rtc::StreamResult Write(const char* data, size_t len);
+  // If |fin| == true, then this stream closes after sending data.
+  rtc::StreamResult Write(const char* data, size_t len, bool fin = false);
+  // Removes this stream from the QuicSession's stream map.
+  void Close();
 
   // Called when decrypted data is ready to be read.
   sigslot::signal3<net::QuicStreamId, const char*, size_t> SignalDataReceived;
-  // Called when stream closed.
-  sigslot::signal2<net::QuicStreamId, net::QuicErrorCode> SignalClosed;
+  // Called when the stream is closed.
+  sigslot::signal2<net::QuicStreamId, int> SignalClosed;
+  // Emits the number of queued bytes that were written by OnCanWrite(), after
+  // the stream was previously write blocked.
+  sigslot::signal2<net::QuicStreamId, uint64_t> SignalQueuedBytesWritten;
 
  private:
   RTC_DISALLOW_COPY_AND_ASSIGN(ReliableQuicStream);