Revert of [Tracing] V8 Tracing Controller

src/libplatform/tracing/trace-writer.cc

-// Copyright 2016 the V8 project 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 "src/libplatform/tracing/trace-writer.h"
-
-#include "src/base/platform/platform.h"
-
-namespace v8 {
-namespace platform {
-namespace tracing {
-
-JSONTraceWriter::JSONTraceWriter(std::ostream& stream) : stream_(stream) {
-  stream_ << "{\"traceEvents\":[";
-}
-
-JSONTraceWriter::~JSONTraceWriter() { stream_ << "]}"; }
-
-void JSONTraceWriter::AppendTraceEvent(TraceObject* trace_event) {
-  if (append_comma_) stream_ << ",";
-  append_comma_ = true;
-  if (trace_event->scope() == NULL) {
-    stream_ << "{\"pid\":" << trace_event->pid()
-            << ",\"tid\":" << trace_event->tid()
-            << ",\"ts\":" << trace_event->ts()
-            << ",\"tts\":" << trace_event->tts() << ",\"ph\":\""
-            << trace_event->phase() << "\",\"cat\":\""
-            << TracingController::GetCategoryGroupName(
-                   trace_event->category_enabled_flag())
-            << "\",\"name\":\"" << trace_event->name()
-            << "\",\"args\":{},\"dur\":" << trace_event->duration()
-            << ",\"tdur\":" << trace_event->cpu_duration() << "}";
-  } else {
-    stream_ << "{\"pid\":" << trace_event->pid()
-            << ",\"tid\":" << trace_event->tid()
-            << ",\"ts\":" << trace_event->ts()
-            << ",\"tts\":" << trace_event->tts() << ",\"ph\":\""
-            << trace_event->phase() << "\",\"cat\":\""
-            << TracingController::GetCategoryGroupName(
-                   trace_event->category_enabled_flag())
-            << "\",\"name\":\"" << trace_event->name() << "\",\"scope\":\""
-            << trace_event->scope()
-            << "\",\"args\":{},\"dur\":" << trace_event->duration()
-            << ",\"tdur\":" << trace_event->cpu_duration() << "}";
-  }
-  // TODO(fmeawad): Add support for Flow Events.
-}
-
-void JSONTraceWriter::Flush() {}
-
-TraceWriter* TraceWriter::CreateJSONTraceWriter(std::ostream& stream) {
-  return new JSONTraceWriter(stream);
-}
-
-}  // namespace tracing
-}  // namespace platform
-}  // namespace v8