Unify the way cctest initalizes the VM for each test case.

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
@@ skipping 33 matching lines @@
 
 TEST(StartStop) {
   CpuProfilesCollection profiles;
   ProfileGenerator generator(&profiles);
   ProfilerEventsProcessor processor(&generator);
   processor.Start();
   processor.Stop();
   processor.Join();
 }
 
-static v8::Persistent<v8::Context> env;
-
-static void InitializeVM() {
-  if (env.IsEmpty()) env = v8::Context::New();
-  v8::HandleScope scope(env->GetIsolate());
-  env->Enter();
-}
-
 static inline i::Address ToAddress(int n) {
   return reinterpret_cast<i::Address>(n);
 }
 
 static void EnqueueTickSampleEvent(ProfilerEventsProcessor* proc,
                                    i::Address frame1,
                                    i::Address frame2 = NULL,
                                    i::Address frame3 = NULL) {
   i::TickSample* sample = proc->TickSampleEvent();
   sample->pc = frame1;
@@ skipping 22 matching lines @@
     i::FLAG_prof_browser_mode = old_flag_prof_browser_mode_;
   }
 
  private:
   bool old_flag_prof_browser_mode_;
 };
 
 }  // namespace
 
 TEST(CodeEvents) {
-  InitializeVM();
+  CcTest::InitializeVM();
   i::Isolate* isolate = i::Isolate::Current();
   i::Heap* heap = isolate->heap();
   i::Factory* factory = isolate->factory();
   TestSetup test_setup;
   CpuProfilesCollection profiles;
   profiles.StartProfiling("", 1, false);
   ProfileGenerator generator(&profiles);
   ProfilerEventsProcessor processor(&generator);
   processor.Start();
 
@@ skipping 95 matching lines @@
   CHECK_EQ("ddd", top_down_stub_children->last()->entry()->name());
   const i::List<ProfileNode*>* top_down_ddd_children =
       top_down_stub_children->last()->children();
   CHECK_EQ(0, top_down_ddd_children->length());
 }
 
 
 // http://crbug/51594
 // This test must not crash.
 TEST(CrashIfStoppingLastNonExistentProfile) {
-  InitializeVM();
+  CcTest::InitializeVM();
   TestSetup test_setup;
   CpuProfiler* profiler = i::Isolate::Current()->cpu_profiler();
   profiler->StartProfiling("1");
   profiler->StopProfiling("2");
   profiler->StartProfiling("1");
   profiler->StopProfiling("");
 }
 
 
 // http://code.google.com/p/v8/issues/detail?id=1398
@@ skipping 30 matching lines @@
   while (node->children()->length() > 0) {
     node = node->children()->last();
     ++actual_depth;
   }
 
   CHECK_EQ(1 + i::TickSample::kMaxFramesCount, actual_depth);  // +1 for PC.
 }
 
 
 TEST(DeleteAllCpuProfiles) {
-  InitializeVM();
+  CcTest::InitializeVM();
   TestSetup test_setup;
   CpuProfiler* profiler = i::Isolate::Current()->cpu_profiler();
   CHECK_EQ(0, profiler->GetProfilesCount());
   profiler->DeleteAllProfiles();
   CHECK_EQ(0, profiler->GetProfilesCount());
 
   profiler->StartProfiling("1");
   profiler->StopProfiling("1");
   CHECK_EQ(1, profiler->GetProfilesCount());
   profiler->DeleteAllProfiles();
@@ skipping 110 matching lines @@
   CHECK_EQ(NULL, cpu_profiler->FindCpuProfile(uid2));
   CHECK_EQ(p3, cpu_profiler->FindCpuProfile(uid3));
   const_cast<v8::CpuProfile*>(p2)->Delete();
   CHECK_EQ(1, cpu_profiler->GetProfileCount());
   CHECK_EQ(NULL, cpu_profiler->FindCpuProfile(uid2));
   CHECK_EQ(p3, cpu_profiler->FindCpuProfile(uid3));
   const_cast<v8::CpuProfile*>(p3)->Delete();
   CHECK_EQ(0, cpu_profiler->GetProfileCount());
   CHECK_EQ(NULL, cpu_profiler->FindCpuProfile(uid3));
 }