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

src/key-accumulator.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_KEY_ACCUMULATOR_H_
 #define V8_KEY_ACCUMULATOR_H_
 
 #include "src/isolate.h"
 #include "src/objects.h"
 
@@ skipping 26 matching lines @@
   ~KeyAccumulator();
 
   bool AddKey(uint32_t key);
   bool AddKey(Object* key, AddKeyConversion convert = DO_NOT_CONVERT);
   bool AddKey(Handle<Object> key, AddKeyConversion convert = DO_NOT_CONVERT);
   void AddKeys(Handle<FixedArray> array,
                AddKeyConversion convert = DO_NOT_CONVERT);
   void AddKeys(Handle<JSObject> array,
                AddKeyConversion convert = DO_NOT_CONVERT);
   void AddKeysFromProxy(Handle<JSObject> array);
+  void AddKeysFromProxy(Handle<FixedArray> keys);
   void AddElementKeysFromInterceptor(Handle<JSObject> array);
   // Jump to the next level, pushing the current |levelLength_| to
   // |levelLengths_| and adding a new list to |elements_|.
   void NextPrototype();
   // Sort the integer indices in the last list in |elements_|
   void SortCurrentElementsList();
   Handle<FixedArray> GetKeys(GetKeysConversion convert = KEEP_NUMBERS);
   int length() { return length_; }
   Isolate* isolate() { return isolate_; }
 
@@ skipping 27 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(KeyAccumulator);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 
 #endif  // V8_KEY_ACCUMULATOR_H_