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

content/browser/renderer_host/render_process_host.h

Index: content/browser/renderer_host/render_process_host.h
diff --git a/content/browser/renderer_host/render_process_host.h b/content/browser/renderer_host/render_process_host.h
index b38402658e297a0061e09cfe23dec2f20da1c73a..b43fbe2efc29df5382ee9ecfd3a0e5a0d2ba81dc 100644
--- a/content/browser/renderer_host/render_process_host.h
+++ b/content/browser/renderer_host/render_process_host.h
@@ -101,6 +101,12 @@ class RenderProcessHost : public IPC::Channel::Sender,
   // 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;
@@ -276,6 +282,11 @@ class RenderProcessHost : public IPC::Channel::Sender,
   // 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_;