Switch profiler from isolates to threads

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index a3c3134c89e032b9817f45008ababb177251371b..4d09f85cbc14dfd057a054961f3e4886a3b427b8 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -1463,25 +1463,21 @@ DART_EXPORT void Dart_EnterIsolate(Dart_Isolate isolate) {
 }
 
 
-DART_EXPORT void Dart_IsolateBlocked() {
-  Isolate* isolate = Isolate::Current();
-  CHECK_ISOLATE(isolate);
-  IsolateProfilerData* profiler_data = isolate->profiler_data();
-  if (profiler_data == NULL) {
+DART_EXPORT void Dart_ThreadDisableProfiling() {
+  Thread* T = Thread::Current();
+  if (T == NULL) {
     return;
   }
-  profiler_data->Block();
+  T->DisableThreadInterrupts();
 }
 
 
-DART_EXPORT void Dart_IsolateUnblocked() {
-  Isolate* isolate = Isolate::Current();
-  CHECK_ISOLATE(isolate);
-  IsolateProfilerData* profiler_data = isolate->profiler_data();
-  if (profiler_data == NULL) {
+DART_EXPORT void Dart_ThreadEnableProfiling() {
+  Thread* T = Thread::Current();
+  if (T == NULL) {
     return;
   }
-  profiler_data->Unblock();
+  T->EnableThreadInterrupts();
 }