Add Chromium-style TimeDelta, Time and TimeTicks classes, and a new ElapsedTimer class.

test/cctest/test-cpu-profiler.cc

Index: test/cctest/test-cpu-profiler.cc
diff --git a/test/cctest/test-cpu-profiler.cc b/test/cctest/test-cpu-profiler.cc
index 6d3c2ee136ce2d7e8c8291e83e815023086f2597..6d66c5e92b79268cfd25e99c44919b931c7f186c 100644
--- a/test/cctest/test-cpu-profiler.cc
+++ b/test/cctest/test-cpu-profiler.cc
@@ -44,14 +44,15 @@ using i::ProfileNode;
 using i::ProfilerEventsProcessor;
 using i::ScopedVector;
 using i::SmartPointer;
+using i::TimeDelta;
 using i::Vector;
 
 
 TEST(StartStop) {
   CpuProfilesCollection profiles;
   ProfileGenerator generator(&profiles);
-  SmartPointer<ProfilerEventsProcessor> processor(
-      new ProfilerEventsProcessor(&generator, NULL, 100));
+  SmartPointer<ProfilerEventsProcessor> processor(new ProfilerEventsProcessor(
+          &generator, NULL, TimeDelta::FromMicroseconds(100)));
   processor->Start();
   processor->StopSynchronously();
 }
@@ -142,8 +143,8 @@ TEST(CodeEvents) {
   CpuProfilesCollection* profiles = new CpuProfilesCollection;
   profiles->StartProfiling("", 1, false);
   ProfileGenerator generator(profiles);
-  SmartPointer<ProfilerEventsProcessor> processor(
-      new ProfilerEventsProcessor(&generator, NULL, 100));
+  SmartPointer<ProfilerEventsProcessor> processor(new ProfilerEventsProcessor(
+          &generator, NULL, TimeDelta::FromMicroseconds(100)));
   processor->Start();
   CpuProfiler profiler(isolate, profiles, &generator, *processor);
 
@@ -204,8 +205,8 @@ TEST(TickEvents) {
   CpuProfilesCollection* profiles = new CpuProfilesCollection;
   profiles->StartProfiling("", 1, false);
   ProfileGenerator generator(profiles);
-  SmartPointer<ProfilerEventsProcessor> processor(
-      new ProfilerEventsProcessor(&generator, NULL, 100));
+  SmartPointer<ProfilerEventsProcessor> processor(new ProfilerEventsProcessor(
+          &generator, NULL, TimeDelta::FromMicroseconds(100)));
   processor->Start();
   CpuProfiler profiler(isolate, profiles, &generator, *processor);
 
@@ -273,8 +274,8 @@ TEST(Issue1398) {
   CpuProfilesCollection* profiles = new CpuProfilesCollection;
   profiles->StartProfiling("", 1, false);
   ProfileGenerator generator(profiles);
-  SmartPointer<ProfilerEventsProcessor> processor(
-      new ProfilerEventsProcessor(&generator, NULL, 100));
+  SmartPointer<ProfilerEventsProcessor> processor(new ProfilerEventsProcessor(
+          &generator, NULL, TimeDelta::FromMicroseconds(100)));
   processor->Start();
   CpuProfiler profiler(isolate, profiles, &generator, *processor);
 
@@ -419,13 +420,10 @@ TEST(ProfileStartEndTime) {
   v8::HandleScope scope(env->GetIsolate());
   v8::CpuProfiler* cpu_profiler = env->GetIsolate()->GetCpuProfiler();
 
-  int64_t time_before_profiling = i::OS::Ticks();

[yurys, 2013/08/28 07:04:21]

You can take Time::NowFromSystemTime() here and leave the checks below.

[Benedikt Meurer, 2013/08/28 07:06:31]

That's a bad idea, because NowFromSystemTime() is using the wallclock, which is
not monotonic and subject to adjustment by ntpd.

   v8::Local<v8::String> profile_name = v8::String::New("test");
   cpu_profiler->StartCpuProfiling(profile_name);
   const v8::CpuProfile* profile = cpu_profiler->StopCpuProfiling(profile_name);
-  CHECK(time_before_profiling <= profile->GetStartTime());
   CHECK(profile->GetStartTime() <= profile->GetEndTime());
-  CHECK(profile->GetEndTime() <= i::OS::Ticks());
 }