Implement `in' for proxies.

src/objects-inl.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4139 matching lines @@
   }
   return SlowAsArrayIndex(index);
 }
 
 
 Object* JSReceiver::GetPrototype() {
   return HeapObject::cast(this)->map()->prototype();
 }
 
 
+bool JSReceiver::HasProperty(String* name) {
+  if (IsJSProxy()) {
+    return JSProxy::cast(this)->HasPropertyWithHandler(name);
+  }
+  return GetPropertyAttribute(name) != ABSENT;
+}
+
+
+bool JSReceiver::HasLocalProperty(String* name) {
+  if (IsJSProxy()) {
+    return JSProxy::cast(this)->HasPropertyWithHandler(name);
+  }
+  return GetLocalPropertyAttribute(name) != ABSENT;
+}
+
+
 PropertyAttributes JSReceiver::GetPropertyAttribute(String* key) {
   return GetPropertyAttributeWithReceiver(this, key);
 }
 
 // TODO(504): this may be useful in other places too where JSGlobalProxy
 // is used.
 Object* JSObject::BypassGlobalProxy() {
   if (IsJSGlobalProxy()) {
     Object* proto = GetPrototype();
     if (proto->IsNull()) return GetHeap()->undefined_value();
@@ skipping 294 matching lines @@
 #undef WRITE_INT_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_