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

content/browser/renderer_host/browser_render_process_host.h

Index: content/browser/renderer_host/browser_render_process_host.h
diff --git a/content/browser/renderer_host/browser_render_process_host.h b/content/browser/renderer_host/browser_render_process_host.h
index d3eee336baa8ec0ee83e940973273aa2049c0a63..810a0f8a646d9ff5015737dd96b7a0ab6d267335 100644
--- a/content/browser/renderer_host/browser_render_process_host.h
+++ b/content/browser/renderer_host/browser_render_process_host.h
@@ -58,6 +58,8 @@ class BrowserRenderProcessHost : public RenderProcessHost,
   virtual void WidgetRestored();
   virtual void WidgetHidden();
   virtual int VisibleWidgetCount() const;
+  virtual void AddPendingView();
+  virtual void RemovePendingView();
   virtual bool FastShutdownIfPossible();
   virtual bool SendWithTimeout(IPC::Message* msg, int timeout_ms);
   virtual base::ProcessHandle GetHandle();
@@ -81,6 +83,7 @@ class BrowserRenderProcessHost : public RenderProcessHost,
   void CreateMessageFilters();
 
   // Control message handlers.
+  void OnShutdownRequest();
   void OnUpdatedCacheStats(const WebKit::WebCache::UsageStats& stats);
   void SuddenTerminationChanged(bool enabled);
   void OnUserMetricsRecordAction(const std::string& action);
@@ -103,6 +106,11 @@ class BrowserRenderProcessHost : public RenderProcessHost,
   // backgrounded.
   int32 visible_widgets_;
 
+  // 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_;
+
   // Does this process have backgrounded priority.
   bool backgrounded_;