SpdySession go-away on network change

net/spdy/spdy_session_pool.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/spdy/spdy_session_pool.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/values.h"
 #include "net/base/address_list.h"
@@ skipping 260 matching lines @@
   return list;
 }
 
 void SpdySessionPool::OnIPAddressChanged() {
   WeakSessionList current_sessions = GetCurrentSessions();
   for (WeakSessionList::const_iterator it = current_sessions.begin();
        it != current_sessions.end(); ++it) {
     if (!*it)
       continue;
 
-    // For OSs that terminate TCP connections upon relevant network changes
-    // there is no need to explicitly close SpdySessions, instead simply mark
-    // the sessions as deprecated so they aren't reused.
+// For OSs that terminate TCP connections upon relevant network changes,
+// attempt to preserve active streams by marking all sessions as going
+// away, rather than explicitly closing them. Streams may still fail due
+// to a generated TCP reset.
 #if defined(OS_ANDROID) || defined(OS_WIN) || defined(OS_IOS)
     (*it)->MakeUnavailable();
+    (*it)->StartGoingAway(kLastStreamId, OK);
+    (*it)->MaybeFinishGoingAway();
 #else
     (*it)->CloseSessionOnError(ERR_NETWORK_CHANGED,
                                "Closing current sessions.");
     DCHECK((*it)->IsDraining());
 #endif  // defined(OS_ANDROID) || defined(OS_WIN) || defined(OS_IOS)
     DCHECK(!IsSessionAvailable(*it));
   }
   http_server_properties_->ClearAllSpdySettings();
 }
 
@@ skipping 96 matching lines @@
 
     if (idle_only && (*it)->is_active())
       continue;
 
     (*it)->CloseSessionOnError(error, description);
     DCHECK(!IsSessionAvailable(*it));
   }
 }
 
 }  // namespace net