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

src/isolate.cc

 // 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.
 
 #include "src/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
 
+#include "include/v8-sampler.h"
 #include "src/ast/ast.h"
 #include "src/ast/scopeinfo.h"
 #include "src/base/platform/platform.h"
 #include "src/base/sys-info.h"
 #include "src/base/utils/random-number-generator.h"
 #include "src/basic-block-profiler.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
 #include "src/compilation-cache.h"
 #include "src/compilation-statistics.h"
@@ skipping 1893 matching lines @@
 
   if (FLAG_print_deopt_stress) {
     PrintF(stdout, "=== Stress deopt counter: %u\n", stress_deopt_count_);
   }
 
   if (cpu_profiler_) {
     cpu_profiler_->DeleteAllProfiles();
   }
 
   // We must stop the logger before we tear down other components.
-  Sampler* sampler = logger_->sampler();
+  // Sampler* sampler = logger_->sampler();
+  V8Sampler* sampler = logger_->sampler();
   if (sampler && sampler->IsActive()) sampler->Stop();
 
   delete deoptimizer_data_;
   deoptimizer_data_ = NULL;
   builtins_.TearDown();
   bootstrapper_->TearDown();
 
   if (runtime_profiler_ != NULL) {
     delete runtime_profiler_;
     runtime_profiler_ = NULL;
@@ skipping 921 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8