[proxies] Implement [[Set]].

src/lookup.h

 // Copyright 2014 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_LOOKUP_H_
 #define V8_LOOKUP_H_
 
 #include "src/factory.h"
 #include "src/isolate.h"
 #include "src/objects.h"
@@ skipping 188 matching lines @@
     return Handle<Map>::cast(transition_);
   }
   template <class T>
   Handle<T> GetHolder() const {
     DCHECK(IsFound());
     return Handle<T>::cast(holder_);
   }
 
   bool HolderIsReceiverOrHiddenPrototype() const;
 
+  bool check_prototype_chain() const {
+    return (configuration_ & kPrototypeChain) != 0;
+  }
+
   /* ACCESS_CHECK */
   bool HasAccess() const;
 
   /* PROPERTY */
   void PrepareForDataProperty(Handle<Object> value);
   void PrepareTransitionToDataProperty(Handle<Object> value,
                                        PropertyAttributes attributes,
                                        Object::StoreFromKeyed store_mode);
   bool IsCacheableTransition() {
     if (state_ != TRANSITION) return false;
@@ skipping 57 matching lines @@
   bool InternalHolderIsReceiverOrHiddenPrototype() const;
   inline InterceptorInfo* GetInterceptor(JSObject* holder) const {
     if (IsElement()) return holder->GetIndexedInterceptor();
     return holder->GetNamedInterceptor();
   }
 
   bool check_hidden() const { return (configuration_ & kHidden) != 0; }
   bool check_interceptor() const {
     return (configuration_ & kInterceptor) != 0;
   }
-  bool check_prototype_chain() const {
-    return (configuration_ & kPrototypeChain) != 0;
-  }
   int descriptor_number() const {
     DCHECK(has_property_);
     DCHECK(!holder_map_->is_dictionary_map());
     return number_;
   }
   int dictionary_entry() const {
     DCHECK(has_property_);
     DCHECK(holder_map_->is_dictionary_map());
     return number_;
   }
@@ skipping 37 matching lines @@
   Handle<Map> holder_map_;
   const Handle<JSReceiver> initial_holder_;
   uint32_t number_;
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_LOOKUP_H_