[proxies] Implement [[Enumerate]] and [[OwnPropertyKeys]]

src/objects.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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 9506 matching lines @@
 
   // ES6 9.5.6
   static bool DefineOwnProperty(Isolate* isolate, Handle<JSProxy> object,
                                 Handle<Object> key, PropertyDescriptor* desc,
                                 ShouldThrow should_throw);
 
   // ES6 9.5.10 (when passed SLOPPY)
   MUST_USE_RESULT static Maybe<bool> DeletePropertyOrElement(
       Handle<JSProxy> proxy, Handle<Name> name, LanguageMode language_mode);
 
+  // ES6 9.5.11
+  static bool Enumerate(Isolate* isolate, Handle<JSReceiver> receiver,
+                        Handle<JSProxy> proxy, KeyAccumulator* accumulator);
+
+  // ES6 9.5.12
+  static bool OwnPropertyKeys(Isolate* isolate, Handle<JSReceiver> receiver,
+                              Handle<JSProxy> proxy, KeyFilter filter,
+                              Enumerability enum_policy,
+                              KeyAccumulator* accumulator);
+
   MUST_USE_RESULT static MaybeHandle<Object> GetPropertyWithHandler(
       Handle<JSProxy> proxy,
       Handle<Object> receiver,
       Handle<Name> name);
 
   // If the handler defines an accessor property with a setter, invoke it.
   // If it defines an accessor property without a setter, or a data property
   // that is read-only, fail.  In all these cases set '*done' to true.
   // Otherwise set it to false, in which case the return value is not
   // meaningful.
@@ skipping 1182 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_