Add test for filtering of IPC messages when RenderFrameHost is swapped out.

content/browser/renderer_host/render_view_host_impl.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 "content/browser/renderer_host/render_view_host_impl.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 559 matching lines @@
   if (suspended_nav_params_)
     suspended_nav_params_.reset();
   navigations_suspended_ = false;
 }
 
 void RenderViewHostImpl::SuppressDialogsUntilSwapOut() {
   Send(new ViewMsg_SuppressDialogsUntilSwapOut(GetRoutingID()));
 }
 
 void RenderViewHostImpl::SwapOut() {
+  // If this RenderViewHost is not in the default state, it must have already
+  // gone through this, therefore just return.
+  if (rvh_state_ != STATE_DEFAULT)
+    return;
+
   SetState(STATE_WAITING_FOR_UNLOAD_ACK);
   unload_event_monitor_timeout_->Start(
       base::TimeDelta::FromMilliseconds(kUnloadTimeoutMS));
 
   if (IsRenderViewLive()) {
     Send(new ViewMsg_SwapOut(GetRoutingID()));
   }
   delegate_->SwappedOut(this);
 }
 
@@ skipping 1330 matching lines @@
   return true;
 }
 
 void RenderViewHostImpl::AttachToFrameTree() {
   FrameTree* frame_tree = delegate_->GetFrameTree();
 
   frame_tree->ResetForMainFrameSwap();
 }
 
 }  // namespace content