V8 Sampling Profiler: Collect V8 sample trace events on Linux and MacOS

content/renderer/devtools/v8_sampling_profiler.h

 // Copyright 2014 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 CONTENT_RENDERER_DEVTOOLS_V8_SAMPLING_PROFILER_H_
 #define CONTENT_RENDERER_DEVTOOLS_V8_SAMPLING_PROFILER_H_
 
 #include "base/synchronization/waitable_event.h"
 #include "base/trace_event/trace_event_impl.h"
 #include "content/common/content_export.h"
@@ skipping 12 matching lines @@
   ~V8SamplingProfiler();
 
   // Implementation of TraceLog::EnabledStateObserver
   void OnTraceLogEnabled() override;
   void OnTraceLogDisabled() override;
 
   void EnableSamplingEventForTesting();
   void WaitSamplingEventForTesting();
 
  private:
+  void StartSamplingThread();
+
   scoped_ptr<base::WaitableEvent> waitable_event_for_testing_;
   scoped_ptr<V8SamplingThread> sampling_thread_;
   scoped_ptr<Sampler> render_thread_sampler_;
+  scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(V8SamplingProfiler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_DEVTOOLS_V8_SAMPLING_PROFILER_H_