Add a callback to inform embedders when an isolate is being shut down.

vm/isolate.cc

 // 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.
 
 #include "vm/isolate.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "lib/mirrors.h"
 #include "vm/compiler_stats.h"
@@ skipping 375 matching lines @@
               "\tisolate:    %s\n", name());
   }
   // TODO(5411455): For now just make sure there are no current isolates
   // as we are shutting down the isolate.
   SetCurrent(NULL);
 }
 
 
 Dart_IsolateCreateCallback Isolate::create_callback_ = NULL;
 Dart_IsolateInterruptCallback Isolate::interrupt_callback_ = NULL;
-
-
-void Isolate::SetCreateCallback(Dart_IsolateCreateCallback cb) {
-  create_callback_ = cb;
-}
-
-
-Dart_IsolateCreateCallback Isolate::CreateCallback() {
-  return create_callback_;
-}
-
-
-void Isolate::SetInterruptCallback(Dart_IsolateInterruptCallback cb) {
-  interrupt_callback_ = cb;
-}
-
-
-Dart_IsolateInterruptCallback Isolate::InterruptCallback() {
-  return interrupt_callback_;
-}
+Dart_IsolateShutdownCallback Isolate::shutdown_callback_ = NULL;
 
 
 void Isolate::VisitObjectPointers(ObjectPointerVisitor* visitor,
                                   bool visit_prologue_weak_handles,
                                   bool validate_frames) {
   ASSERT(visitor != NULL);
 
   // Visit objects in the object store.
   object_store()->VisitObjectPointers(visitor);
 
@@ skipping 31 matching lines @@
 
 
 void Isolate::VisitWeakPersistentHandles(HandleVisitor* visitor,
                                          bool visit_prologue_weak_handles) {
   if (api_state() != NULL) {
     api_state()->VisitWeakHandles(visitor, visit_prologue_weak_handles);
   }
 }
 
 }  // namespace dart