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 c79748fd26ec2529760ab9b907327fa8907161fc..a45d40212e3e8d739aeb8c2514e79a144506921d 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -1457,25 +1457,21 @@ 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_ThreadBlocked() {
+  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_ThreadUnblocked() {
+  Thread* T = Thread::Current();
+  if (T == NULL) {
     return;
   }
-  profiler_data->Unblock();
+  T->EnableThreadInterrupts();
 }