Revert of Trace FrameTreeNode Snapshots

content/browser/frame_host/traced_frame_tree_node.cc

-// 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 "content/browser/frame_host/traced_frame_tree_node.h"
-
-#include "base/command_line.h"
-#include "base/json/json_writer.h"
-#include "base/strings/stringprintf.h"
-#include "content/browser/frame_host/frame_tree.h"
-#include "content/public/common/content_switches.h"
-#include "url/gurl.h"
-
-namespace content {
-
-TracedFrameTreeNode::TracedFrameTreeNode(const FrameTreeNode& node)
-    : parent_node_id_(-1),
-      process_id_(-1),
-      routing_id_(-1) {
-  FrameTreeNode* parent = node.parent();
-  if (parent)
-    parent_node_id_ = parent->frame_tree_node_id();
-
-  RenderFrameHostImpl* current_frame_host = node.current_frame_host();
-  if (!current_frame_host)
-    return;
-
-  if (current_frame_host->last_committed_url().is_valid())
-    url_ = current_frame_host->last_committed_url().spec();
-
-  base::ProcessHandle process_handle =
-    current_frame_host->GetProcess()->GetHandle();
-  if (process_handle == base::kNullProcessHandle)
-    return;
-
-  // On Windows, |rph->GetHandle()| does not duplicate ownership
-  // of the process handle and the render host still retains it. Therefore, we
-  // cannot create a base::Process object, which provides a proper way to get a
-  // process id, from the handle. For a stopgap, we use this deprecated
-  // function that does not require the ownership (http://crbug.com/417532).
-  process_id_ = base::GetProcId(process_handle);
-
-  routing_id_ = current_frame_host->GetRoutingID();
-  DCHECK_NE(routing_id_, MSG_ROUTING_NONE);
-}
-
-TracedFrameTreeNode::~TracedFrameTreeNode() {
-}
-
-void TracedFrameTreeNode::AppendAsTraceFormat(std::string* out) const {
-  scoped_ptr<base::DictionaryValue> value(new base::DictionaryValue());
-
-  if (parent_node_id_ >= 0) {
-    scoped_ptr<base::DictionaryValue> ref(new base::DictionaryValue());
-    ref->SetString("id_ref", base::StringPrintf("0x%x", parent_node_id_));
-    ref->SetString("scope", "FrameTreeNode");
-    value->Set("parent", std::move(ref));
-  }
-
-  if (process_id_ >= 0) {
-    scoped_ptr<base::DictionaryValue> ref(new base::DictionaryValue());
-    ref->SetInteger("pid_ref", process_id_);
-    ref->SetString("id_ref", base::StringPrintf("0x%x", routing_id_));
-    ref->SetString("scope", "RenderFrame");
-    value->Set("RenderFrame", std::move(ref));
-  }
-
-  if (!url_.empty())
-    value->SetString("url", url_);
-
-  std::string tmp;
-  base::JSONWriter::Write(*value, &tmp);
-  *out += tmp;
-}
-
-}  // content