Prepare for per frame did{Start,Stop}Loading calls

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 5c33ed62460413f69beb2f3faa34fd3ff203601f..31f3ccd552617f0de3b0d05602d597d505bffd41 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -416,10 +416,12 @@ class CONTENT_EXPORT RenderViewImpl
   virtual bool enumerateChosenDirectory(
       const blink::WebString& path,
       blink::WebFileChooserCompletion* chooser_completion);
+  // DEPRECATED
   virtual void didStartLoading(bool to_different_document);
   // DEPRECATED
-  virtual void didStartLoading();
   virtual void didStopLoading();
+  virtual void didStartLoading(blink::WebFrame* frame);
+  virtual void didStopLoading(blink::WebFrame* frame);
   virtual void didChangeLoadProgress(blink::WebFrame* frame,
                                      double load_progress);
   virtual void didCancelCompositionOnSelectionChange();
@@ -1155,9 +1157,6 @@ class CONTENT_EXPORT RenderViewImpl
 
   // Loading state -------------------------------------------------------------
 
-  // True if the top level frame is currently being loaded.
-  bool is_loading_;
-
   // The gesture that initiated the current navigation.
   NavigationGesture navigation_gesture_;