Add Perceived PageLoad Time (PPLT) metrics for Prerender Experiments,...

chrome/browser/prerender/prerender_contents.h

Index: chrome/browser/prerender/prerender_contents.h
===================================================================
--- chrome/browser/prerender/prerender_contents.h	(revision 72694)
+++ chrome/browser/prerender/prerender_contents.h	(working copy)
@@ -67,6 +67,7 @@
   }
   string16 title() const { return title_; }
   int32 page_id() const { return page_id_; }
+  bool has_stopped_loading() const { return has_stopped_loading_; }
 
   // Indicates whether this prerendered page can be used for the provided
   // URL, i.e. whether there is a match.
@@ -91,6 +92,7 @@
                                     IPC::Message* reply_msg,
                                     bool* did_suppress_message);
   virtual void Close(RenderViewHost* render_view_host);
+  virtual void DidStopLoading();
   virtual RendererPreferences GetRendererPrefs(Profile* profile) const;
 
   // RenderViewHostDelegate::View
@@ -206,6 +208,8 @@
   // such as HTTP redirects or javascript redirects.
   std::vector<GURL> alias_urls_;
 
+  bool has_stopped_loading_;
+
   DISALLOW_COPY_AND_ASSIGN(PrerenderContents);
 };