Add multithreading test for SamplingCircularQueue, fix implementation.

src/cpu-profiler.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 136 matching lines @@
                        Address start, unsigned size);
   void CodeCreateEvent(Logger::LogEventsAndTags tag,
                        int args_count,
                        Address start, unsigned size);
   void CodeMoveEvent(Address from, Address to);
   void CodeDeleteEvent(Address from);
   void FunctionCreateEvent(Address alias, Address start);
   void FunctionMoveEvent(Address from, Address to);
   void FunctionDeleteEvent(Address from);
 
-  // Tick sampler registration. Called by sampler thread or signal handler.
-  inline void SetUpSamplesProducer() { ticks_buffer_.SetUpProducer(); }
   // 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* TickSampleEvent());
-  inline void TearDownSamplesProducer() { ticks_buffer_.TearDownProducer(); }
 
  private:
   union CodeEventsContainer {
     CodeEventRecord generic;
 #define DECLARE_CLASS(ignore, type) type type##_;
     CODE_EVENTS_TYPE_LIST(DECLARE_CLASS)
 #undef DECLARE_TYPE
   };
 
   // Called from events processing thread (Run() method.)
   bool ProcessCodeEvent(unsigned* dequeue_order);
   bool ProcessTicks(unsigned dequeue_order);
 
   ProfileGenerator* generator_;
   bool running_;
   CircularQueue<CodeEventsContainer> events_buffer_;
   SamplingCircularQueue ticks_buffer_;
   unsigned enqueue_order_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_CPU_PROFILER_H_