Add external byte array API and finalize external strings and byte arrays.

runtime/vm/dart_api_state.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_DART_API_STATE_H_
 #define VM_DART_API_STATE_H_
 
 #include "include/dart_api.h"
 
 #include "vm/dart_api_impl.h"
@@ skipping 109 matching lines @@
   RawObject* raw() const { return raw_; }
   void set_raw(RawObject* raw) { raw_ = raw; }
   void set_raw(const LocalHandle& ref) { raw_ = ref.raw(); }
   void set_raw(const Object& object) { raw_ = object.raw(); }
   static intptr_t raw_offset() { return OFFSET_OF(WeakPersistentHandle, raw_); }
   void* peer() const { return peer_; }
   void set_peer(void* peer) { peer_ = peer; }
   Dart_PeerFinalizer callback() const { return callback_; }
   void set_callback(Dart_PeerFinalizer callback) { callback_ = callback; }
 
-  void Finalize() {
-    if (callback_ != NULL) {
-      (*callback_)(peer_);
+  static void Finalize(WeakPersistentHandle* handle) {
+    if (handle->callback() != NULL) {
+      Dart_PeerFinalizer callback = handle->callback();
+      void* peer = handle->peer();
+      handle->Clear();
+      (*callback)(reinterpret_cast<Dart_Handle>(handle), peer);
+    } else {
+      handle->Clear();
     }
-    Clear();
   }
 
  private:
   friend class WeakPersistentHandles;
 
   WeakPersistentHandle() : raw_(NULL), peer_(NULL), callback_(NULL) { }
   ~WeakPersistentHandle() { }
 
   // Overload the callback_ field as a next pointer when adding freed
   // handles to the free list.
@@ skipping 358 matching lines @@
   PersistentHandle* null_;
   PersistentHandle* true_;
   PersistentHandle* false_;
 
   DISALLOW_COPY_AND_ASSIGN(ApiState);
 };
 
 }  // namespace dart
 
 #endif  // VM_DART_API_STATE_H_