Move DidStartLoading, DidStopLoading, DidChangeLoadProgress to RFHI.

content/browser/frame_host/navigator.h

Index: content/browser/frame_host/navigator.h
diff --git a/content/browser/frame_host/navigator.h b/content/browser/frame_host/navigator.h
index 7390426a8d41a72b0c59c68d440a1ba678270dde..5bd83d0c0eb2ee03d0683c7ecdc8dcfa3fd22542 100644
--- a/content/browser/frame_host/navigator.h
+++ b/content/browser/frame_host/navigator.h
@@ -88,6 +88,19 @@ class CONTENT_EXPORT Navigator : public base::RefCounted<Navigator> {
       FrameTreeNode* frame_tree_node,
       NavigationController::ReloadType reload_type);
 
+  // A RenderFrame in the specified |frame_tree_node| started loading a new
+  // document. This correponds to Blink's notion of the throbber starting.
+  // |to_different_document| will be true unless the load is a fragment
+  // navigation, or triggered by history.pushState/replaceState.
+  virtual void DidStartLoading(FrameTreeNode* frame_tree_node,
+                               bool to_different_document) {}
+
+  // A document stopped loading. This corresponds to Blink's notion of the
+  // throbber stopping.
+  virtual void DidStopLoading() {}
+
+  // The load progress was changed.
+  virtual void DidChangeLoadProgress() {}
 
   // Navigation requests -------------------------------------------------------