Add pause/resume for isolates in vmservice/observatory.

runtime/vm/message_handler.h

 // Copyright (c) 2011, 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_MESSAGE_HANDLER_H_
 #define VM_MESSAGE_HANDLER_H_
 
 #include "vm/message.h"
 #include "vm/thread.h"
 #include "vm/thread_pool.h"
@@ skipping 61 matching lines @@
   }
 
   bool pause_on_start() const {
     return pause_on_start_;
   }
 
   void set_pause_on_start(bool pause_on_start) {
     pause_on_start_ = pause_on_start;
   }
 
+  bool paused_on_start() const {
+    // If pause_on_start_ is still set, tell the user we are paused,
+    // even if we haven't hit the pause point yet.
+    return pause_on_start_;
+  }
+
   bool pause_on_exit() const {
     return pause_on_exit_;
   }
 
   void set_pause_on_exit(bool pause_on_exit) {
     pause_on_exit_ = pause_on_exit;
   }
 
   bool paused_on_exit() const {
     return paused_on_exit_;
@@ skipping 74 matching lines @@
   StartCallback start_callback_;
   EndCallback end_callback_;
   CallbackData callback_data_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageHandler);
 };
 
 }  // namespace dart
 
 #endif  // VM_MESSAGE_HANDLER_H_