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

src/log.cc

Index: src/log.cc
diff --git a/src/log.cc b/src/log.cc
index 0289586e5b6d2adf6245f7fdf4315172a9d1b959..4b1119988c75459cf087d8077bdb8f0349e24878 100644
--- a/src/log.cc
+++ b/src/log.cc
@@ -7,6 +7,7 @@
 #include <cstdarg>
 #include <sstream>
 
+#include "include/v8-sampler.h"
 #include "src/bailout-reason.h"
 #include "src/base/platform/platform.h"
 #include "src/bootstrapper.h"
@@ -20,6 +21,7 @@
 #include "src/runtime-profiler.h"
 #include "src/string-stream.h"
 #include "src/vm-state-inl.h"
+#include <iostream>
 
 namespace v8 {
 namespace internal {
@@ -674,10 +676,10 @@ class Profiler: public base::Thread {
 // Ticker used to provide ticks to the profiler and the sliding state
 // window.
 //
-class Ticker: public Sampler {
+class Ticker: public V8Sampler {
  public:
-  Ticker(Isolate* isolate, int interval):
-      Sampler(isolate, interval),
+  Ticker(Isolate* isolate):
+      V8Sampler(reinterpret_cast<v8::Isolate*>(isolate)),
       profiler_(NULL) {}
 
   ~Ticker() { if (IsActive()) Stop(); }
@@ -1840,7 +1842,7 @@ bool Logger::SetUp(Isolate* isolate) {
     addCodeEventListener(ll_logger_);
   }
 
-  ticker_ = new Ticker(isolate, kSamplingIntervalMs);
+  ticker_ = new Ticker(isolate);
 
   if (Log::InitLogAtStart()) {
     is_logging_ = true;
@@ -1878,7 +1880,8 @@ void Logger::SetCodeEventHandler(uint32_t options,
 }
 
 
-Sampler* Logger::sampler() {
+// Sampler* Logger::sampler() {
+V8Sampler* Logger::sampler() {
   return ticker_;
 }