Switch profiler from isolates to threads

runtime/include/dart_api.h

Index: runtime/include/dart_api.h
diff --git a/runtime/include/dart_api.h b/runtime/include/dart_api.h
index b851d717b46949b88a07befe3d50954836398270..43a90d69eb5d7beca28099dabc8ec1d337db9a75 100755
--- a/runtime/include/dart_api.h
+++ b/runtime/include/dart_api.h
@@ -1010,14 +1010,14 @@ DART_EXPORT Dart_Handle Dart_DebugName();
 DART_EXPORT void Dart_EnterIsolate(Dart_Isolate isolate);
 
 /**
- * Notifies the VM that the current isolate is about to make a blocking call.
+ * Notifies the VM that the current thread is about to make a blocking call.
  */
-DART_EXPORT void Dart_IsolateBlocked();
+DART_EXPORT void Dart_ThreadBlocked();

[siva, 2015/10/26 23:45:26]

With the new safepointing code a Blocked thread is going to have a special
meaning and tracking state, calling this Dart_ThreadBlocked may  confuse people
with safepoint stuff.

Can we call this
 - Dart_DisableThreadProfiling
 - Dart_EnableThreadProfiling
instead?

[Cutch, 2015/10/27 22:36:24]

Done.

Dart_ThreadDisableProfiling
Dart_ThreadEnableProfiling

 
 /**
- * Notifies the VM that the current isolate is no longer blocked.
+ * Notifies the VM that the current thread is no longer blocked.
  */
-DART_EXPORT void Dart_IsolateUnblocked();
+DART_EXPORT void Dart_ThreadUnblocked();
 
 /**
  * Exits an isolate. After this call, Dart_CurrentIsolate will