Add necessary support functions so that embedders can implemented pause on start and exit

runtime/vm/isolate.h

 // 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.
 
 #ifndef VM_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/atomic.h"
@@ skipping 335 matching lines @@
     bool error_on_bad_override_;
 
     friend class Isolate;
 
     DISALLOW_ALLOCATION();
     DISALLOW_COPY_AND_ASSIGN(Flags);
   };
 
   const Flags& flags() const { return flags_; }
 
-  // Requests that the debugger resume execution.
-  void Resume() {
+  // Lets the embedder know that a service message resulted in a resume request.
+  void SetResumeRequest() {
     resume_request_ = true;
     set_last_resume_timestamp();
   }
 
   void set_last_resume_timestamp() {
     last_resume_timestamp_ = OS::GetCurrentTimeMillis();
   }
 
   int64_t last_resume_timestamp() const {
     return last_resume_timestamp_;
@@ skipping 623 matching lines @@
   intptr_t* spawn_count_;
 
   Isolate::Flags isolate_flags_;
   bool paused_;
   bool errors_are_fatal_;
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_