Refactor isolate startup code in preparation for making isolate spawning more truly non-blocking.

runtime/vm/object.h

 // Copyright (c) 2012, 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_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 6907 matching lines @@
  public:
   RawSendPort* send_port() const { return raw_ptr()->send_port_; }
   Dart_Port Id() const { return send_port()->ptr()->id_; }
 
   RawInstance* handler() const { return raw_ptr()->handler_; }
   void set_handler(const Instance& value) const;
 
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawReceivePort));
   }
-  static RawReceivePort* New(Dart_Port id, Heap::Space space = Heap::kNew);
+  static RawReceivePort* New(Dart_Port id,
+                             bool is_control_port,
+                             Heap::Space space = Heap::kNew);
 
  private:
   FINAL_HEAP_OBJECT_IMPLEMENTATION(ReceivePort, Instance);
   friend class Class;
 };
 
 
 class SendPort : public Instance {
  public:
   Dart_Port Id() const { return raw_ptr()->id_; }
@@ skipping 380 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_