Move DidStartLoading, DidStopLoading, DidChangeLoadProgress to RFHI.

content/browser/frame_host/frame_tree.h

Index: content/browser/frame_host/frame_tree.h
diff --git a/content/browser/frame_host/frame_tree.h b/content/browser/frame_host/frame_tree.h
index 164c3c1d5851cea6bf40c4680fcc9222fe734a4a..ce34bc287f1ea9ad6206d832666dd762b078f9fd 100644
--- a/content/browser/frame_host/frame_tree.h
+++ b/content/browser/frame_host/frame_tree.h
@@ -130,8 +130,11 @@ class CONTENT_EXPORT FrameTree {
   // the listener installed by SetFrameRemoveListener.
   void FrameRemoved(FrameTreeNode* frame);
 
+  // Updates the overall load progress and notifies the WebContents.
+  void UpdateLoadProgress();
+
   // Returns this FrameTree's total load progress.
-  double GetLoadProgress();
+  double load_progress() { return load_progress_; }
 
   // Resets the load progress on all nodes in this FrameTree.
   void ResetLoadProgress();
@@ -178,6 +181,9 @@ class CONTENT_EXPORT FrameTree {
 
   base::Callback<void(RenderFrameHost*)> on_frame_removed_;
 
+  // Overall load progress.
+  double load_progress_;
+
   DISALLOW_COPY_AND_ASSIGN(FrameTree);
 };