Introduce v8::CpuProfiler::New and v8::CpuProfiler::Dispose API.

test/cctest/profiler-extension.cc

Index: test/cctest/profiler-extension.cc
diff --git a/test/cctest/profiler-extension.cc b/test/cctest/profiler-extension.cc
index 024cc9c635a3d1b97d9c474a004b866e8598507b..38008685146265bda64f65a10a47185ba776eee4 100644
--- a/test/cctest/profiler-extension.cc
+++ b/test/cctest/profiler-extension.cc
@@ -33,7 +33,18 @@
 namespace v8 {
 namespace internal {
 
-v8::CpuProfile* ProfilerExtension::last_profile = NULL;
+ProfilerExtension::Scope::Scope(v8::Isolate* isolate) {
+  DCHECK(!profiler_);
+  profiler_ = v8::CpuProfiler::New(isolate);
+}
+
+ProfilerExtension::Scope::~Scope() {
+  profiler_->Dispose();
+  profiler_ = nullptr;
+}
+
+v8::CpuProfiler* ProfilerExtension::Scope::profiler_ = nullptr;
+v8::CpuProfile* ProfilerExtension::last_profile = nullptr;
 const char* ProfilerExtension::kSource =
     "native function startProfiling();"
     "native function stopProfiling();"
@@ -58,24 +69,22 @@ v8::Local<v8::FunctionTemplate> ProfilerExtension::GetNativeFunctionTemplate(
 
 void ProfilerExtension::StartProfiling(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
-  last_profile = NULL;
-  v8::CpuProfiler* cpu_profiler = args.GetIsolate()->GetCpuProfiler();
-  cpu_profiler->StartProfiling((args.Length() > 0)
-      ? args[0].As<v8::String>()
-      : v8::String::Empty(args.GetIsolate()));
+  last_profile = nullptr;
+  Scope::profiler_->StartProfiling((args.Length() > 0)
+                                       ? args[0].As<v8::String>()
+                                       : v8::String::Empty(args.GetIsolate()));
 }
 
 void ProfilerExtension::StopProfiling(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
-  v8::CpuProfiler* cpu_profiler = args.GetIsolate()->GetCpuProfiler();
-  last_profile = cpu_profiler->StopProfiling((args.Length() > 0)
-      ? args[0].As<v8::String>()
-      : v8::String::Empty(args.GetIsolate()));
+  last_profile = Scope::profiler_->StopProfiling(
+      (args.Length() > 0) ? args[0].As<v8::String>()
+                          : v8::String::Empty(args.GetIsolate()));
 }
 
 void ProfilerExtension::CollectSample(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
-  args.GetIsolate()->GetCpuProfiler()->CollectSample();
+  Scope::profiler_->CollectSample();
 }
 
 }  // namespace internal