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

src/profiler/cpu-profiler.cc

Index: src/profiler/cpu-profiler.cc
diff --git a/src/profiler/cpu-profiler.cc b/src/profiler/cpu-profiler.cc
index b6c7945797bc702cb647c5de58195f90ff6ae967..940d39e176d33e8460611298bdff7ed2136b3719 100644
--- a/src/profiler/cpu-profiler.cc
+++ b/src/profiler/cpu-profiler.cc
@@ -4,6 +4,7 @@
 
 #include "src/profiler/cpu-profiler.h"
 
+#include "include/v8-sampler.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/frames-inl.h"
@@ -21,7 +22,7 @@ static const int kProfilerStackSize = 64 * KB;
 
 
 ProfilerEventsProcessor::ProfilerEventsProcessor(ProfileGenerator* generator,
-                                                 Sampler* sampler,
+                                                 V8Sampler* sampler,
                                                  base::TimeDelta period)
     : Thread(Thread::Options("v8:ProfEvntProc", kProfilerStackSize)),
       generator_(generator),
@@ -458,7 +459,8 @@ void CpuProfiler::StartProcessorIfNotStarted() {
   saved_is_logging_ = logger->is_logging_;
   logger->is_logging_ = false;
   generator_ = new ProfileGenerator(profiles_);
-  Sampler* sampler = logger->sampler();
+  // Sampler* sampler = logger->sampler();
+  V8Sampler* sampler = logger->sampler();
   processor_ = new ProfilerEventsProcessor(
       generator_, sampler, sampling_interval_);
   is_profiling_ = true;
@@ -504,7 +506,8 @@ void CpuProfiler::StopProcessorIfLastProfile(const char* title) {
 
 void CpuProfiler::StopProcessor() {
   Logger* logger = isolate_->logger();
-  Sampler* sampler = reinterpret_cast<Sampler*>(logger->ticker_);
+  // Sampler* sampler = reinterpret_cast<Sampler*>(logger->ticker_);
+  V8Sampler* sampler = reinterpret_cast<V8Sampler*>(logger->ticker_);
   is_profiling_ = false;
   processor_->StopSynchronously();
   delete processor_;