Add support for [TreatNullAs] extended attribute for reflected attributes

Source/core/html/HTMLInputElement.idl

 /*
  * Copyright (C) 2006, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 [
 ] interface HTMLInputElement : HTMLElement {
-    [Reflect] attribute DOMString accept;
-    [Reflect] attribute DOMString alt;
-    [Reflect] attribute DOMString autocomplete;
+    [Reflect, TreatNullAs=NullString] attribute DOMString accept;
+    [Reflect, TreatNullAs=NullString] attribute DOMString alt;
+    [Reflect, TreatNullAs=NullString] attribute DOMString autocomplete;
     [Reflect] attribute boolean autofocus;
     [Reflect=checked] attribute boolean defaultChecked;
     attribute boolean checked;
-    [Reflect] attribute DOMString dirName;
+    [Reflect, TreatNullAs=NullString] attribute DOMString dirName;
     [Reflect] attribute boolean disabled;
     readonly attribute HTMLFormElement form;
     // The 'files' attribute is intentionally not readonly.
     // https://www.w3.org/Bugs/Public/show_bug.cgi?id=22682
     attribute FileList files;
-    [Reflect, URL] attribute DOMString formAction;
+    [Reflect, TreatNullAs=NullString, URL] attribute DOMString formAction;
     [TreatNullAs=NullString, CustomElementCallbacks] attribute DOMString formEnctype;
     [TreatNullAs=NullString, CustomElementCallbacks] attribute DOMString formMethod;
     [Reflect] attribute boolean formNoValidate;
-    [Reflect] attribute DOMString formTarget;
+    [Reflect, TreatNullAs=NullString] attribute DOMString formTarget;
     [CustomElementCallbacks] attribute unsigned long height;
     attribute boolean indeterminate;
     [EnabledAtRuntime=DataListElement] readonly attribute HTMLElement list;
-    [Reflect] attribute DOMString max;
+    [Reflect, TreatNullAs=NullString] attribute DOMString max;
     [SetterRaisesException, CustomElementCallbacks] attribute long maxLength;
-    [Reflect] attribute DOMString min;
+    [Reflect, TreatNullAs=NullString] attribute DOMString min;
     [Reflect] attribute boolean multiple;
-    [Reflect] attribute DOMString name;
-    [Reflect] attribute DOMString pattern;
-    [Reflect] attribute DOMString placeholder;
+    [Reflect, TreatNullAs=NullString] attribute DOMString name;
+    [Reflect, TreatNullAs=NullString] attribute DOMString pattern;
+    [Reflect, TreatNullAs=NullString] attribute DOMString placeholder;
     [Reflect] attribute boolean readOnly;
     [Reflect] attribute boolean required;
     [SetterRaisesException, CustomElementCallbacks] attribute unsigned long size; // Changed string -> long -> unsigned long
-    [Reflect, URL] attribute DOMString src;
-    [Reflect] attribute DOMString step;
+    [Reflect, TreatNullAs=NullString, URL] attribute DOMString src;
+    [Reflect, TreatNullAs=NullString] attribute DOMString step;
     [TreatNullAs=NullString, CustomElementCallbacks] attribute DOMString type; // readonly dropped as part of DOM level 2
     [TreatNullAs=NullString, CustomElementCallbacks] attribute DOMString defaultValue;
     // See the discussion in https://bugs.webkit.org/show_bug.cgi?id=100085
     [TreatNullAs=NullString, SetterRaisesException, CustomElementCallbacks] attribute DOMString value;
     [SetterRaisesException, CustomElementCallbacks] attribute Date valueAsDate;
     [SetterRaisesException, CustomElementCallbacks] attribute double valueAsNumber;
-    [EnabledAtRuntime=InputModeAttribute, Reflect] attribute DOMString inputMode;
+    [EnabledAtRuntime=InputModeAttribute, Reflect, TreatNullAs=NullString] attribute DOMString inputMode;
 
     [RaisesException, CustomElementCallbacks] void stepUp(optional long n);
     [RaisesException, CustomElementCallbacks] void stepDown(optional long n);
 
     [CustomElementCallbacks] attribute unsigned long width;
     readonly attribute boolean willValidate;
     readonly attribute ValidityState validity;
     readonly attribute DOMString validationMessage;
     boolean checkValidity();
     void setCustomValidity([TreatNullAs=NullString, TreatUndefinedAs=NullString] DOMString error);
@@ skipping 10 matching lines @@
                         unsigned long start,
                         unsigned long end,
                         [Default=NullString] optional DOMString selectionMode);
 
     [RaisesException, ImplementedAs=setSelectionRangeForBinding]
     void setSelectionRange([Default=Undefined] optional long start,
                            [Default=Undefined] optional long end,
                            optional DOMString direction);
 
     // Non-standard attributes
-    [Reflect] attribute DOMString align;
+    [Reflect, TreatNullAs=NullString] attribute DOMString align;
     [Reflect, EnabledAtRuntime=DirectoryUpload] attribute boolean webkitdirectory;
-    [Reflect] attribute DOMString useMap;
+    [Reflect, TreatNullAs=NullString] attribute DOMString useMap;
     [Reflect] attribute boolean incremental;
     [Conditional=INPUT_SPEECH, Reflect, EnabledAtRuntime=SpeechInput] attribute boolean webkitSpeech;
     [Conditional=INPUT_SPEECH, Reflect, EnabledAtRuntime=SpeechInput] attribute boolean webkitGrammar;
     [Conditional=INPUT_SPEECH, NotEnumerable] attribute EventHandler onwebkitspeechchange;
 
     // See http://www.w3.org/TR/html-media-capture/
     [Conditional=MEDIA_CAPTURE, Reflect] attribute boolean capture;
 };