Support window.opener after a process swap.

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..68958ff8e440078d062920a10d1c36b9b99b8123 100644
--- a/content/browser/renderer_host/browser_render_process_host.h
+++ b/content/browser/renderer_host/browser_render_process_host.h
@@ -50,7 +50,7 @@ class BrowserRenderProcessHost : public RenderProcessHost,
   virtual bool Init(bool is_accessibility_enabled, bool is_extensions_process);
   virtual int GetNextRoutingID();
   virtual void CancelResourceRequests(int render_widget_id);
-  virtual void CrossSiteClosePageACK(const ViewMsg_ClosePage_Params& params);
+  virtual void CrossSiteSwapOutACK(const ViewMsg_SwapOut_Params& params);
   virtual bool WaitForUpdateMsg(int render_widget_id,
                                 const base::TimeDelta& max_delay,
                                 IPC::Message* msg);
@@ -58,6 +58,9 @@ class BrowserRenderProcessHost : public RenderProcessHost,
   virtual void WidgetRestored();
   virtual void WidgetHidden();
   virtual int VisibleWidgetCount() const;
+  virtual void AddPendingView();
+  virtual void RemovePendingView();
+  virtual int PendingViewCount() const;
   virtual bool FastShutdownIfPossible();
   virtual bool SendWithTimeout(IPC::Message* msg, int timeout_ms);
   virtual base::ProcessHandle GetHandle();
@@ -81,6 +84,7 @@ 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 +107,11 @@ class BrowserRenderProcessHost : public RenderProcessHost,
   // backgrounded.
   int32 visible_widgets_;
 
+  // The count of currently swapped out but pending RenderViews.  We have
+  // started to swap these back 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_;