First cut at API for ES6 ArrayBuffers

src/runtime.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 726 matching lines @@
   MUST_USE_RESULT static MaybeObject* GetObjectProperty(
       Isolate* isolate,
       Handle<Object> object,
       Handle<Object> key);
 
   MUST_USE_RESULT static MaybeObject* GetObjectPropertyOrFail(
       Isolate* isolate,
       Handle<Object> object,
       Handle<Object> key);
 
+  static bool SetupArrayBuffer(Isolate* isolate,
+                               Handle<JSArrayBuffer> array_buffer,
+                               void* data,
+                               size_t allocated_length);
+
+  static bool AllocateAndSetupArrayBuffer(
+      Isolate* isolate,
+      Handle<JSArrayBuffer> array_buffer,
+      size_t allocated_length);
+
   // Helper functions used stubs.
   static void PerformGC(Object* result);
 
   // Used in runtime.cc and hydrogen's VisitArrayLiteral.
   static Handle<Object> CreateArrayLiteralBoilerplate(
       Isolate* isolate,
       Handle<FixedArray> literals,
       Handle<FixedArray> elements);
 };
 
 
 //---------------------------------------------------------------------------
 // Constants used by interface to runtime functions.
 
 class DeclareGlobalsEvalFlag:     public BitField<bool,         0, 1> {};
 class DeclareGlobalsNativeFlag:   public BitField<bool,         1, 1> {};
 class DeclareGlobalsLanguageMode: public BitField<LanguageMode, 2, 2> {};
 
 } }  // namespace v8::internal
 
 #endif  // V8_RUNTIME_H_