[m52] Send QUIC ping packets when there are draining streams, even if there are no open streams.

net/quic/quic_chromium_client_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_chromium_client_session.h"
 
 #include <utility>
 
 #include "base/callback_helpers.h"
 #include "base/location.h"
@@ skipping 896 matching lines @@
   logger_->OnSuccessfulVersionNegotiation(version);
   QuicSpdySession::OnSuccessfulVersionNegotiation(version);
 }
 
 void QuicChromiumClientSession::OnPathDegrading() {
   if (stream_factory_) {
     stream_factory_->MaybeMigrateSessionEarly(this);
   }
 }
 
+bool QuicChromiumClientSession::HasOpenDynamicStreams() const {
+  return QuicSession::HasOpenDynamicStreams() ||
+         GetNumDrainingOutgoingStreams() > 0;
+}
+
 void QuicChromiumClientSession::OnProofValid(
     const QuicCryptoClientConfig::CachedState& cached) {
   DCHECK(cached.proof_valid());
 
   if (!server_info_) {
     return;
   }
 
   QuicServerInfo::State* state = server_info_->mutable_state();
 
@@ skipping 250 matching lines @@
 }
 
 void QuicChromiumClientSession::DeletePromised(
     QuicClientPromisedInfo* promised) {
   if (IsOpenStream(promised->id()))
     streams_pushed_and_claimed_count_++;
   QuicClientSessionBase::DeletePromised(promised);
 }
 
 }  // namespace net