[WIP]Create a V8 sampler library and tracing controller.

src/profiler/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_PROFILER_CPU_PROFILER_H_
 #define V8_PROFILER_CPU_PROFILER_H_
 
 #include "src/allocation.h"
 #include "src/atomic-utils.h"
 #include "src/base/atomicops.h"
 #include "src/base/platform/time.h"
 #include "src/compiler.h"
 #include "src/locked-queue.h"
 #include "src/profiler/circular-queue.h"
 #include "src/profiler/sampler.h"
 
 namespace v8 {
+
+class V8Sampler;
+
 namespace internal {
 
 // Forward declarations.
 class CodeEntry;
 class CodeMap;
 class CompilationInfo;
 class CpuProfile;
 class CpuProfilesCollection;
 class ProfileGenerator;
 
@@ skipping 93 matching lines @@
 #undef DECLARE_TYPE
   };
 };
 
 
 // This class implements both the profile events processor thread and
 // methods called by event producers: VM and stack sampler threads.
 class ProfilerEventsProcessor : public base::Thread {
  public:
   ProfilerEventsProcessor(ProfileGenerator* generator,
-                          Sampler* sampler,
+                          V8Sampler* sampler,
                           base::TimeDelta period);
   virtual ~ProfilerEventsProcessor();
 
   // Thread control.
   virtual void Run();
   void StopSynchronously();
   INLINE(bool running()) { return !!base::NoBarrier_Load(&running_); }
   void Enqueue(const CodeEventsContainer& event);
 
   // Puts current stack into tick sample events buffer.
@@ skipping 17 matching lines @@
   bool ProcessCodeEvent();
 
   enum SampleProcessingResult {
     OneSampleProcessed,
     FoundSampleForNextCodeEvent,
     NoSamplesInQueue
   };
   SampleProcessingResult ProcessOneSample();
 
   ProfileGenerator* generator_;
-  Sampler* sampler_;
+  V8Sampler* sampler_;
   base::Atomic32 running_;
   const base::TimeDelta period_;  // Samples & code events processing period.
   LockedQueue<CodeEventsContainer> events_buffer_;
   static const size_t kTickSampleBufferSize = 1 * MB;
   static const size_t kTickSampleQueueLength =
       kTickSampleBufferSize / sizeof(TickSampleEventRecord);
   SamplingCircularQueue<TickSampleEventRecord,
                         kTickSampleQueueLength> ticks_buffer_;
   LockedQueue<TickSampleEventRecord> ticks_from_vm_buffer_;
   AtomicNumber<unsigned> last_code_event_id_;
@@ skipping 89 matching lines @@
   bool is_profiling_;
 
   DISALLOW_COPY_AND_ASSIGN(CpuProfiler);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 
 #endif  // V8_PROFILER_CPU_PROFILER_H_