Report approximated duration in milliseconds for profile nodes.

src/cpu-profiler.cc

Index: src/cpu-profiler.cc
diff --git a/src/cpu-profiler.cc b/src/cpu-profiler.cc
index 5ee0739b9ea113ff4587fb01dc1d63f453e83cff..b8bff262f4289ff6d698ae00dd91c22b96dbeed4 100644
--- a/src/cpu-profiler.cc
+++ b/src/cpu-profiler.cc
@@ -436,8 +436,9 @@ void CpuProfiler::StartProcessorIfNotStarted() {
 
 
 CpuProfile* CpuProfiler::StopCollectingProfile(const char* title) {
+  const double actual_sampling_rate = generator_->actual_sampling_rate();
   StopProcessorIfLastProfile();
-  CpuProfile* result = profiles_->StopProfiling(title);
+  CpuProfile* result = profiles_->StopProfiling(title, actual_sampling_rate);
   if (result != NULL) {
     result->Print();
   }
@@ -446,8 +447,9 @@ CpuProfile* CpuProfiler::StopCollectingProfile(const char* title) {
 
 
 CpuProfile* CpuProfiler::StopCollectingProfile(String* title) {
+  const double actual_sampling_rate = generator_->actual_sampling_rate();
   StopProcessorIfLastProfile();
-  return profiles_->StopProfiling(title);
+  return profiles_->StopProfiling(title, actual_sampling_rate);
 }