Revert of [Tracing] V8 Tracing Controller

src/libplatform/tracing/trace-buffer.h

-// 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.
-
-#ifndef SRC_LIBPLATFORM_TRACING_TRACE_BUFFER_H_
-#define SRC_LIBPLATFORM_TRACING_TRACE_BUFFER_H_
-
-#include <memory>
-#include <vector>
-
-#include "include/libplatform/v8-tracing.h"
-#include "src/base/platform/mutex.h"
-
-namespace v8 {
-namespace platform {
-namespace tracing {
-
-class TraceBufferRingBuffer : public TraceBuffer {
- public:
-  TraceBufferRingBuffer(size_t max_chunks, TraceWriter* trace_writer);
-  ~TraceBufferRingBuffer();
-
-  TraceObject* AddTraceEvent(uint64_t* handle) override;
-  TraceObject* GetEventByHandle(uint64_t handle) override;
-  bool Flush() override;
-
- private:
-  uint64_t MakeHandle(size_t chunk_index, uint32_t chunk_seq,
-                      size_t event_index) const;
-  void ExtractHandle(uint64_t handle, size_t* chunk_index, uint32_t* chunk_seq,
-                     size_t* event_index) const;
-  size_t Capacity() const { return max_chunks_ * TraceBufferChunk::kChunkSize; }
-  size_t NextChunkIndex(size_t index) const;
-
-  mutable base::Mutex mutex_;
-  size_t max_chunks_;
-  std::unique_ptr<TraceWriter> trace_writer_;
-  std::vector<std::unique_ptr<TraceBufferChunk>> chunks_;
-  size_t chunk_index_;
-  bool is_empty_ = true;
-  uint32_t current_chunk_seq_ = 1;
-};
-
-}  // namespace tracing
-}  // namespace platform
-}  // namespace v8
-
-#endif  // SRC_LIBPLATFORM_TRACING_TRACE_BUFFER_H_