Reland Trace FrameTreeNode Snapshots

content/browser/frame_host/frame_tree_node.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_NODE_H_
 #define CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_NODE_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 254 matching lines @@
   // Called when the user closed the modal dialogue for BeforeUnload and
   // cancelled the navigation. This should stop any load happening in the
   // FrameTreeNode.
   void BeforeUnloadCanceled();
 
  private:
   class OpenerDestroyedObserver;
 
   void set_parent(FrameTreeNode* parent) { parent_ = parent; }
 
+  void TraceSnapshot() const;
+
   // The next available browser-global FrameTreeNode ID.
   static int next_frame_tree_node_id_;
 
   // The FrameTree that owns us.
   FrameTree* frame_tree_;  // not owned.
 
   // The Navigator object responsible for managing navigations at this node
   // of the frame tree.
   scoped_refptr<Navigator> navigator_;
 
@@ skipping 61 matching lines @@
   base::ObserverList<Observer> observers_;
 
   base::TimeTicks last_focus_time_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameTreeNode);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_NODE_H_