Support idle time in CPU profiler

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index c0f7a97f790a674dedff7013c5fa7bf5730a5be5..9bbb65cc2020637c9cc5fdea8321417cb6c0af0c 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -7637,6 +7637,17 @@ void CpuProfiler::DeleteAllCpuProfiles() {
 }
 
 
+void CpuProfiler::SetIdle(bool is_idle) {
+  i::Isolate* isolate = reinterpret_cast<i::CpuProfiler*>(this)->isolate();
+  if (isolate->js_entry_sp() != NULL) return;
+  if (is_idle) {

[Yang, 2013/08/07 16:23:27]

Could we assert that the current vm state at this point is either IDLE or
EXTERNAL?

[yurys, 2013/08/07 16:55:44]

Done.

+    isolate->set_current_vm_state(i::IDLE);
+  } else if (isolate->current_vm_state() == i::IDLE) {
+    isolate->set_current_vm_state(i::EXTERNAL);
+  }
+}
+
+
 static i::HeapGraphEdge* ToInternal(const HeapGraphEdge* edge) {
   return const_cast<i::HeapGraphEdge*>(
       reinterpret_cast<const i::HeapGraphEdge*>(edge));