Fix a QUIC flow control bug where a stream is flow control blocked when

net/quic/quic_session.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/quic_session.h"
 
 #include "base/stl_util.h"
 #include "net/quic/crypto/proof_verifier.h"
 #include "net/quic/quic_connection.h"
 #include "net/quic/quic_flags.h"
@@ skipping 515 matching lines @@
     return;
   }
 
   // Inform all existing streams about the new window.
   if (connection_->version() >= QUIC_VERSION_21) {
     GetCryptoStream()->flow_controller()->UpdateSendWindowOffset(new_window);
     headers_stream_->flow_controller()->UpdateSendWindowOffset(new_window);
   }
   for (DataStreamMap::iterator it = stream_map_.begin();
        it != stream_map_.end(); ++it) {
-    it->second->flow_controller()->UpdateSendWindowOffset(new_window);
+    if (it->second->flow_controller()->UpdateSendWindowOffset(new_window)) {
+      it->second->OnCanWrite();
+    }
   }
 }
 
 void QuicSession::OnNewSessionFlowControlWindow(uint32 new_window) {
   if (new_window < kDefaultFlowControlSendWindow) {
     LOG(ERROR)
         << "Peer sent us an invalid session flow control send window: "
         << new_window << ", below default: " << kDefaultFlowControlSendWindow;
     if (connection_->connected()) {
       connection_->SendConnectionClose(QUIC_FLOW_CONTROL_INVALID_WINDOW);
@@ skipping 229 matching lines @@
 
   // Disable stream level flow control based on negotiated version. Streams may
   // have been created with a different version.
   if (version < QUIC_VERSION_21) {
     GetCryptoStream()->flow_controller()->Disable();
     headers_stream_->flow_controller()->Disable();
   }
 }
 
 }  // namespace net