Add infrastructure to keep track of references to prototypes.

src/isolate.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.
 
 #ifndef V8_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include "include/v8-debug.h"
 #include "src/allocation.h"
 #include "src/assert-scope.h"
@@ skipping 744 matching lines @@
   // Returns if the top context may access the given global object. If
   // the result is false, the pending exception is guaranteed to be
   // set.
 
   bool MayNamedAccess(Handle<JSObject> receiver,
                       Handle<Object> key,
                       v8::AccessType type);
   bool MayIndexedAccess(Handle<JSObject> receiver,
                         uint32_t index,
                         v8::AccessType type);
+  bool IsInternallyUsedPropertyName(Handle<Object> name);
+  bool IsInternallyUsedPropertyName(Object* name);
 
   void SetFailedAccessCheckCallback(v8::FailedAccessCheckCallback callback);
   void ReportFailedAccessCheck(Handle<JSObject> receiver, v8::AccessType type);
 
   // Exception throwing support. The caller should use the result
   // of Throw() as its return value.
   Object* Throw(Object* exception, MessageLocation* location = NULL);
 
   template <typename T>
   MUST_USE_RESULT MaybeHandle<T> Throw(Handle<Object> exception,
@@ skipping 777 matching lines @@
   }
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_