Add SelectionMode enum for setRangeText() in HTMLInputElement and HTMLTextAreaElement

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.
  */
 
 // https://html.spec.whatwg.org/#the-input-element
 
+enum SelectionMode { "select", "start", "end", "preserve" };
+
 interface HTMLInputElement : HTMLElement {
     [Reflect] attribute DOMString accept;
     [Reflect] attribute DOMString alt;
     [Reflect] attribute DOMString autocomplete;
     [Reflect] attribute boolean autofocus;
     [Reflect=checked] attribute boolean defaultChecked;
     attribute boolean checked;
     [Reflect] attribute DOMString dirName;
     [Reflect] attribute boolean disabled;
     [ImplementedAs=formOwner] readonly attribute HTMLFormElement? form;
@@ skipping 42 matching lines @@
     void setCustomValidity(DOMString error);
 
     readonly attribute NodeList labels;
 
     void select();
     // FIXME: selectionStart and selectionEnd should be unsigned long.
     [RaisesException, ImplementedAs=selectionStartForBinding] attribute long selectionStart;
     [RaisesException, ImplementedAs=selectionEndForBinding] attribute long selectionEnd;
     [RaisesException, ImplementedAs=selectionDirectionForBinding] attribute DOMString selectionDirection;
     [RaisesException] void setRangeText(DOMString replacement);
-    // FIXME: The selectionMode argument should be a SelectionMode enum.
     [RaisesException] void setRangeText(DOMString replacement,
                                         unsigned long start,
                                         unsigned long end,
-                                        optional DOMString selectionMode = "preserve");
+                                        optional SelectionMode selectionMode = "preserve");
     // FIXME: The start and end arguments should be unsigned long and should not have [Default=Undefined].
     [RaisesException, ImplementedAs=setSelectionRangeForBinding]
     void setSelectionRange([Default=Undefined] optional long start,
                            [Default=Undefined] optional long end,
                            optional DOMString direction);
 
     // obsolete members
     // https://html.spec.whatwg.org/#HTMLInputElement-partial
     [Reflect] attribute DOMString align;
     [Reflect] attribute DOMString useMap;
 
     // HTML autocapitalize proposal
     // https://github.com/mounirlamouri/html-autocapitalize/blob/master/proposal.md
     [Measure] attribute DOMString autocapitalize;
 
     // HTML Media Capture
     // http://www.w3.org/TR/html-media-capture/
     [RuntimeEnabled=MediaCapture, Reflect] attribute boolean capture;
 
     // Non-standard APIs
     [Reflect, MeasureAs=PrefixedDirectoryAttribute] attribute boolean webkitdirectory;
     [Reflect, MeasureAs=IncrementalAttribute] attribute boolean incremental;
 };