Report approximated duration in milliseconds for profile nodes.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 3e3865ff26c7d16e80ee68a8663fe9493a6da394..4752a442525784a1ffbb45ecd648b5e10bc076f1 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -4058,6 +4058,18 @@ int CpuProfileNode::GetLineNumber() const {
 }
 
 
+double CpuProfileNode::GetTotalTime() const {
+  IsDeadCheck("v8::CpuProfileNode::GetTotalTime");
+  return reinterpret_cast<const i::ProfileNode*>(this)->GetTotalMillis();
+}
+
+
+double CpuProfileNode::GetSelfTime() const {
+  IsDeadCheck("v8::CpuProfileNode::GetSelfTime");
+  return reinterpret_cast<const i::ProfileNode*>(this)->GetSelfMillis();
+}
+
+
 double CpuProfileNode::GetTotalSamplesCount() const {
   IsDeadCheck("v8::CpuProfileNode::GetTotalSamplesCount");
   return reinterpret_cast<const i::ProfileNode*>(this)->total_ticks();