Add support for medium integers to the native message format

runtime/vm/dart_api_message.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_DART_API_MESSAGE_H_
 #define VM_DART_API_MESSAGE_H_
 
 #include "vm/dart_api_state.h"
 #include "vm/snapshot.h"
 
@@ skipping 11 matching lines @@
   // Allocates a Dart_CObject object.
   Dart_CObject* AllocateDartCObject();
   // Allocates a Dart_CObject object with the specified type.
   Dart_CObject* AllocateDartCObject(Dart_CObject::Type type);
   // Allocates a Dart_CObject object for the null object.
   Dart_CObject* AllocateDartCObjectNull();
   // Allocates a Dart_CObject object for a boolean object.
   Dart_CObject* AllocateDartCObjectBool(bool value);
   // Allocates a Dart_CObject object for for a 32-bit integer.
   Dart_CObject* AllocateDartCObjectInt32(int32_t value);
+  // Allocates a Dart_CObject object for for a 64-bit integer.
+  Dart_CObject* AllocateDartCObjectInt64(int64_t value);
   // Allocates a Dart_CObject object for a double.
   Dart_CObject* AllocateDartCObjectDouble(double value);
   // Allocates a Dart_CObject object for string data.
   Dart_CObject* AllocateDartCObjectString(intptr_t length);
   // Allocates a C array of Dart_CObject objects.
   Dart_CObject* AllocateDartCObjectArray(intptr_t length);
 
   void Init();
 
   intptr_t LookupInternalClass(intptr_t class_header);
@@ skipping 16 matching lines @@
   ReAlloc alloc_;
   ApiGrowableArray<Dart_CObject*> backward_references_;
 
   Dart_CObject type_arguments_marker;
   Dart_CObject dynamic_type_marker;
 };
 
 }  // namespace dart
 
 #endif  // VM_DART_API_MESSAGE_H_