[api] Expose instanceof through v8::Value::InstanceOf.

include/v8.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 2277 matching lines @@
   V8_DEPRECATE_SOON("Use maybe version", bool Equals(Local<Value> that) const);
   V8_WARN_UNUSED_RESULT Maybe<bool> Equals(Local<Context> context,
                                            Local<Value> that) const;
   bool StrictEquals(Local<Value> that) const;
   bool SameValue(Local<Value> that) const;
 
   template <class T> V8_INLINE static Value* Cast(T* value);
 
   Local<String> TypeOf(Isolate*);
 
+  Maybe<bool> InstanceOf(Local<Context> context, Local<Object> object);
+
  private:
   V8_INLINE bool QuickIsUndefined() const;
   V8_INLINE bool QuickIsNull() const;
   V8_INLINE bool QuickIsNullOrUndefined() const;
   V8_INLINE bool QuickIsString() const;
   bool FullIsUndefined() const;
   bool FullIsNull() const;
   bool FullIsString() const;
 };
 
@@ skipping 7692 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // INCLUDE_V8_H_