Refactor isolate interrupts to use OOB messages instead of interrupt bits.

runtime/vm/service.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 "vm/service.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/globals.h"
 
@@ skipping 2405 matching lines @@
 }
 
 
 static const MethodParameter* pause_params[] = {
   ISOLATE_PARAMETER,
   NULL,
 };
 
 
 static bool Pause(Isolate* isolate, JSONStream* js) {
-  // TODO(turnidge): Don't double-interrupt the isolate here.
-  isolate->ScheduleInterrupts(Isolate::kApiInterrupt);
+  // TODO(turnidge): This interrupt message could have been sent from
+  // the service isolate directly, but would require some special case
+  // code.  That would prevent this isolate getting double-interrupted
+  // with OOB messages.
+  isolate->SendInternalLibMessage(Isolate::kInterruptMsg,
+                                  isolate->pause_capability());
   PrintSuccess(js);
   return true;
 }
 
 
 static const MethodParameter* get_tag_profile_params[] = {
   ISOLATE_PARAMETER,
   NULL,
 };
 
@@ skipping 767 matching lines @@
     ServiceMethodDescriptor& method = service_methods_[i];
     if (strcmp(method_name, method.name) == 0) {
       return &method;
     }
   }
   return NULL;
 }
 
 
 }  // namespace dart