Fix a QUIC bug where the headers stream becomes flow control blocked and

net/quic/reliable_quic_stream.h

Index: net/quic/reliable_quic_stream.h
diff --git a/net/quic/reliable_quic_stream.h b/net/quic/reliable_quic_stream.h
index 5b5ae0ff835cfee5149da009697e2ff8c34480ca..24bc34988320bc3c153cd61213d06347365b6395 100644
--- a/net/quic/reliable_quic_stream.h
+++ b/net/quic/reliable_quic_stream.h
@@ -111,6 +111,10 @@ class NET_EXPORT_PRIVATE ReliableQuicStream {
   // WINDOW_UPDATE frame.
   void AddBytesConsumed(uint64 bytes);
 
+  // Updates the flow controller's send window offset and calls OnCanWrite if
+  // it was blocked before.
+  void UpdateSendWindowOffset(uint64 new_offset);
+
   // Returns true if the stream is flow control blocked, by the stream flow
   // control window or the connection flow control window.
   bool IsFlowControlBlocked();
@@ -123,6 +127,9 @@ class NET_EXPORT_PRIVATE ReliableQuicStream {
     return fin_received_ || rst_received_;
   }
 
+  // Returns true if the stream has queued data waiting to write.
+  bool HasBufferedData() const;
+
  protected:
   // Sends as much of 'data' to the connection as the connection will consume,
   // and then buffers any remaining data in queued_data_.
@@ -151,8 +158,6 @@ class NET_EXPORT_PRIVATE ReliableQuicStream {
   // Close the write side of the socket.  Further writes will fail.
   void CloseWriteSide();
 
-  bool HasBufferedData() const;
-
   bool fin_buffered() const { return fin_buffered_; }
 
   const QuicSession* session() const { return session_; }