Store the callstack of the IPC sender of ViewMsg_New

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index 8496410534f581ab43826c6adba418952fbade5b..311291878342bd27b535dce76cbb964e18f010f5 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -203,6 +203,8 @@ class CONTENT_EXPORT RenderViewImpl
     return history_controller_.get();
   }
 
+  const std::vector<unsigned long>& debug_info() { return debug_info_; }
+
   // Functions to add and remove observers for this object.
   void AddObserver(RenderViewObserver* observer);
   void RemoveObserver(RenderViewObserver* observer);
@@ -1041,6 +1043,9 @@ class CONTENT_EXPORT RenderViewImpl
 
   bool page_scale_factor_is_one_;
 
+  // Temporary debug information to help track http://crbug.com/464633.
+  std::vector<unsigned long> debug_info_;
+
   // ---------------------------------------------------------------------------
   // ADDING NEW DATA? Please see if it fits appropriately in one of the above
   // sections rather than throwing it randomly at the end. If you're adding a