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

net/quic/reliable_quic_stream.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/reliable_quic_stream.h"
 
 #include "base/logging.h"
 #include "net/quic/iovector.h"
 #include "net/quic/quic_flow_controller.h"
 #include "net/quic/quic_session.h"
@@ skipping 514 matching lines @@
     if (!read_side_closed_) {
       flow_controller_.AddBytesConsumed(bytes);
     }
 
     if (stream_contributes_to_connection_flow_control_) {
       connection_flow_controller_->AddBytesConsumed(bytes);
     }
   }
 }
 
+void ReliableQuicStream::UpdateSendWindowOffset(uint64 new_window) {
+  if (flow_controller_.UpdateSendWindowOffset(new_window)) {
+    OnCanWrite();
+  }
+}
+
 bool ReliableQuicStream::IsFlowControlBlocked() {
   if (flow_controller_.IsBlocked()) {
     return true;
   }
   return stream_contributes_to_connection_flow_control_ &&
       connection_flow_controller_->IsBlocked();
 }
 
 }  // namespace net