Add new Dart API call Dart_MakeIsolateRunnable(). This would allow an

runtime/vm/dart_api_impl.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "include/dart_api.h"
 
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
@@ skipping 920 matching lines @@
 
 DART_EXPORT void Dart_InterruptIsolate(Dart_Isolate isolate) {
   if (isolate == NULL) {
     FATAL1("%s expects argument 'isolate' to be non-null.",  CURRENT_FUNC);
   }
   Isolate* iso = reinterpret_cast<Isolate*>(isolate);
   iso->ScheduleInterrupts(Isolate::kApiInterrupt);
 }
 
 
+DART_EXPORT Dart_Handle Dart_MakeIsolateRunnable() {
+  Isolate* isolate = Isolate::Current();
+  CHECK_ISOLATE(isolate);
+  bool retval = isolate->MakeRunnable();
+  if (retval == false) {
+    return Api::NewError("%s expects the isolate to not be already runnable.",
+                         CURRENT_FUNC);
+  }
+  return Api::Success(isolate);
+}
+
+
 // --- Messages and Ports ---
 
 DART_EXPORT void Dart_SetMessageNotifyCallback(
     Dart_MessageNotifyCallback message_notify_callback) {
   Isolate* isolate = Isolate::Current();
   CHECK_ISOLATE(isolate);
   isolate->set_message_notify_callback(message_notify_callback);
 }
 
 
@@ skipping 3857 matching lines @@
   }
   {
     NoGCScope no_gc;
     RawObject* raw_obj = obj.raw();
     isolate->heap()->SetPeer(raw_obj, peer);
   }
   return Api::Success(isolate);
 }
 
 }  // namespace dart