about:net-internals#prerender: Add information about load state of prerender

chrome/browser/prerender/prerender_contents.cc

Index: chrome/browser/prerender/prerender_contents.cc
===================================================================
--- chrome/browser/prerender/prerender_contents.cc	(revision 201078)
+++ chrome/browser/prerender/prerender_contents.cc	(working copy)
@@ -702,6 +702,8 @@
   base::TimeTicks current_time = base::TimeTicks::Now();
   base::TimeDelta duration = current_time - load_start_time_;
   dict_value->SetInteger("duration", duration.InSeconds());
+  dict_value->SetBoolean("is_loaded", prerender_contents_ &&
+                                      !prerender_contents_->IsLoading());
   return dict_value;
 }