Give prerendering RVH's RenderWidgetHostViews.

chrome/browser/prerender/prerender_contents.h

Index: chrome/browser/prerender/prerender_contents.h
===================================================================
--- chrome/browser/prerender/prerender_contents.h	(revision 82104)
+++ chrome/browser/prerender/prerender_contents.h	(working copy)
@@ -20,10 +20,11 @@
 #include "content/common/window_container_type.h"
 #include "webkit/glue/window_open_disposition.h"
 
+class RenderViewHost;
 class TabContents;
 struct FaviconURL;
+struct ViewHostMsg_FrameNavigate_Params;
 struct WebPreferences;
-struct ViewHostMsg_FrameNavigate_Params;
 
 namespace base {
 class ProcessMetrics;
@@ -66,7 +67,10 @@
 
   static Factory* CreateFactory();
 
-  virtual void StartPrerendering();
+  // |source_render_view_host| is the RenderViewHost that initiated
+  // prerendering.  It must be non-NULL and have its own view.  It is used
+  // solely to determine the window bounds while prerendering.
+  virtual void StartPrerendering(const RenderViewHost* source_render_view_host);
 
   // Verifies that the prerendering is not using too many resources, and kills
   // it if not.
@@ -100,6 +104,14 @@
   void set_final_status(FinalStatus final_status);
   FinalStatus final_status() const;
 
+  // Set instead of |final_status_| when it is not safe to immediately destroy
+  // the PrerenderContents.  It is not guaranteed that the pending status will
+  // be the final FinalStatus if the PrerenderContents is cancelled for some
+  // other reason in the meantime, but it is guaranteed that once set, the RVH
+  // of the PrerenderContents will not be used.
+  void set_pending_final_status(FinalStatus pending_final_status);
+  FinalStatus pending_final_status() const;
+
   base::TimeTicks load_start_time() const { return load_start_time_; }
 
   // Indicates whether this prerendered page can be used for the provided
@@ -261,6 +273,7 @@
   bool has_stopped_loading_;
 
   FinalStatus final_status_;
+  FinalStatus pending_final_status_;
 
   bool prerendering_has_started_;