Avoid exiting the renderer process if it has a pending render view.

content/browser/renderer_host/render_process_host.h

 // Copyright (c) 2011 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_PROCESS_HOST_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_PROCESS_HOST_H_
 #pragma once
 
 #include <set>
 
@@ skipping 83 matching lines @@
   void Attach(IPC::Channel::Listener* listener, int routing_id);
 
   // See Attach()
   void Release(int listener_id);
 
   // Listeners should call this when they've sent a "Close" message and
   // they're waiting for a "Close_ACK", so that if the renderer process
   // goes away we'll know that it was intentional rather than a crash.
   void ReportExpectingClose(int32 listener_id);
 
+  // Track the count of pending views that are being swapped back in.  Called
+  // by listeners to register and unregister pending views to prevent the
+  // process from exiting.
+  void AddPendingView();
+  void RemovePendingView();
+
   // Allows iteration over this RenderProcessHost's RenderViewHost listeners.
   // Use from UI thread only.
   typedef IDMap<IPC::Channel::Listener>::const_iterator listeners_iterator;
 
   listeners_iterator ListenersIterator() {
     return listeners_iterator(&listeners_);
   }
 
   IPC::Channel::Listener* GetListenerByID(int routing_id) {
     return listeners_.Lookup(routing_id);
@@ skipping 155 matching lines @@
 
   // The maximum page ID we've ever seen from the renderer process.
   int32 max_page_id_;
 
   // True if fast shutdown has been performed on this RPH.
   bool fast_shutdown_started_;
 
   // True if we've posted a DeleteTask and will be deleted soon.
   bool deleting_soon_;
 
+  // The count of currently swapped out but pending RenderViews.  We have
+  // started to swap these in, so the renderer process should not exit if
+  // this count is non-zero.
+  int32 pending_views_;
+
  private:
   // The globally-unique identifier for this RPH.
   int id_;
 
   Profile* profile_;
 
   // set of listeners that expect the renderer process to close
   std::set<int> listeners_expecting_close_;
 
   // True if the process can be shut down suddenly.  If this is true, then we're
@@ skipping 20 matching lines @@
 // Factory object for RenderProcessHosts. Using this factory allows tests to
 // swap out a different one to use a TestRenderProcessHost.
 class RenderProcessHostFactory {
  public:
   virtual ~RenderProcessHostFactory() {}
   virtual RenderProcessHost* CreateRenderProcessHost(
       Profile* profile) const = 0;
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_PROCESS_HOST_H_