Tracing V2 prototype [NOT FOR REVIEW]

base/trace_event/trace_log.h

 // Copyright 2015 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 BASE_TRACE_EVENT_TRACE_LOG_H_
 #define BASE_TRACE_EVENT_TRACE_LOG_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/atomicops.h"
 #include "base/containers/hash_tables.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
 #include "base/trace_event/memory_dump_provider.h"
 #include "base/trace_event/trace_config.h"
 #include "base/trace_event/trace_event_impl.h"
 #include "build/build_config.h"
+#include "base/trace_event/v2/ring_buffer.h"
 
 namespace base {
 
 template <typename Type>
 struct DefaultSingletonTraits;
 class RefCountedString;
 
 namespace trace_event {
 
 class TraceBuffer;
@@ skipping 457 matching lines @@
   size_t thread_shared_chunk_index_;
 
   // Set when asynchronous Flush is in progress.
   OutputCallback flush_output_callback_;
   scoped_refptr<SingleThreadTaskRunner> flush_task_runner_;
   ArgumentFilterPredicate argument_filter_predicate_;
   subtle::AtomicWord generation_;
   bool use_worker_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(TraceLog);
+
+public:
+  static bool use_v2;
+  uint8_t v2_buf[1024 * 1024];
+  v2::RingBuffer v2_rb;
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_TRACE_LOG_H_