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

test/cctest/test-cpu-profiler.cc

 // 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
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 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 //
 // Tests of profiles generator and utilities.
 
 #include "src/v8.h"
 
 #include "include/v8-profiler.h"
+#include "include/v8-sampler.h"
 #include "src/base/platform/platform.h"
 #include "src/base/smart-pointers.h"
 #include "src/deoptimizer.h"
 #include "src/profiler/cpu-profiler-inl.h"
 #include "src/utils.h"
 #include "test/cctest/cctest.h"
 #include "test/cctest/profiler-extension.h"
 using i::CodeEntry;
 using i::CpuProfile;
 using i::CpuProfiler;
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                                    v8::Local<v8::Value> argv[], int argc,
                                    unsigned min_js_samples = 0,
                                    unsigned min_external_samples = 0,
                                    bool collect_samples = false) {
   v8::CpuProfiler* cpu_profiler = env->GetIsolate()->GetCpuProfiler();
   v8::Local<v8::String> profile_name = v8_str("my_profile");
 
   cpu_profiler->SetSamplingInterval(100);
   cpu_profiler->StartProfiling(profile_name, collect_samples);
 
-  i::Sampler* sampler =
+  v8::V8Sampler* sampler =
       reinterpret_cast<i::Isolate*>(env->GetIsolate())->logger()->sampler();
   sampler->StartCountingSamples();
   do {
     function->Call(env, env->Global(), argc, argv).ToLocalChecked();
   } while (sampler->js_sample_count() < min_js_samples ||
            sampler->external_sample_count() < min_external_samples);
 
   v8::CpuProfile* profile = cpu_profiler->StopProfiling(profile_name);
 
   CHECK(profile);
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   iprofile->Print();
   v8::CpuProfile* profile = reinterpret_cast<v8::CpuProfile*>(iprofile);
 
   const char* branch[] = {"", "test"};
   const ProfileNode* itest_node =
       GetSimpleBranch(env, profile, branch, arraysize(branch));
   CHECK_EQ(0U, itest_node->deopt_infos().size());
 
   iprofiler->DeleteProfile(iprofile);
 }