Introduce browser side FrameTreeNodeBlameContext

content/browser/frame_host/traced_frame_tree_node.h

-// Copyright 2016 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.
-
-#include "base/macros.h"
-#include "base/memory/scoped_vector.h"
-#include "base/trace_event/trace_event_impl.h"
-#include "base/values.h"
-#include "content/common/content_export.h"
-
-namespace content {
-
-class FrameTree;
-class FrameTreeNode;
-
-// This is a temporary container used when tracing snapshots of FrameTree
-// objects. When a snapshot of a FrameTree is taken, a TracedFrameTreeNode is
-// created and stored by the tracing system until the trace is dumped.
-class CONTENT_EXPORT TracedFrameTreeNode :
-  public base::trace_event::ConvertableToTraceFormat {
- public:
-  TracedFrameTreeNode(const FrameTreeNode& node);
-  void AppendAsTraceFormat(std::string* out) const override;
-
- private:
-  ~TracedFrameTreeNode() override;
-
-  int parent_node_id_;
-  std::string url_;
-  int process_id_;
-  int routing_id_;
-
-  DISALLOW_COPY_AND_ASSIGN(TracedFrameTreeNode);
-};
-
-}  // content