Changed StackZone and ApiZone to be containers for Zone.

runtime/vm/globals.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_GLOBALS_H_
 #define VM_GLOBALS_H_
 
 // This file contains global definitions for the VM library only. Anything that
 // is more globally useful should be added to 'vm/globals.h'.
 
@@ skipping 52 matching lines @@
 
 
 // When using GCC we can use GCC attributes to ensure that certain
 // contants are 16 byte aligned.
 #if defined(TARGET_OS_WINDOWS)
 #define ALIGN16 __declspec(align(16))
 #else
 #define ALIGN16 __attribute__((aligned(16)))
 #endif
 
+
+// Zap value used to indicate uninitialized handle area (debug purposes).
+#if defined(ARCH_IS_32_BIT)
+static const uword kZapUninitializedWord = 0xabababab;
+#else
+static const uword kZapUninitializedWord = 0xabababababababab;
+#endif
+
+
 }  // namespace dart
 
 #endif  // VM_GLOBALS_H_