[WIP] A sampler thread in d8 for consuming the new API.

src/cpu-profiler.h

 // Copyright 2012 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 V8_CPU_PROFILER_H_
 #define V8_CPU_PROFILER_H_
 
 #include "src/allocation.h"
 #include "src/base/atomicops.h"
 #include "src/base/platform/time.h"
@@ skipping 127 matching lines @@
   // Puts current stack into tick sample events buffer.
   void AddCurrentStack(Isolate* isolate);
 
   // Tick sample events are filled directly in the buffer of the circular
   // queue (because the structure is of fixed width, but usually not all
   // stack frame entries are filled.) This method returns a pointer to the
   // next record of the buffer.
   inline TickSample* StartTickSample();
   inline void FinishTickSample();
 
+  Sampler* sampler() const { return sampler_; }
+
   // SamplingCircularQueue has stricter alignment requirements than a normal new
   // can fulfil, so we need to provide our own new/delete here.
   void* operator new(size_t size);
   void operator delete(void* ptr);
 
  private:
   // Called from events processing thread (Run() method.)
   bool ProcessCodeEvent();
 
   enum SampleProcessingResult {
@@ skipping 108 matching lines @@
   bool saved_is_logging_;
   bool is_profiling_;
 
   DISALLOW_COPY_AND_ASSIGN(CpuProfiler);
 };
 
 } }  // namespace v8::internal
 
 
 #endif  // V8_CPU_PROFILER_H_