Use multiline attribute to check for IA2_STATE_MULTILINE.

ui/accessibility/ax_enums.idl

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // These should be kept in sync with third_party/WebKit/public/web/WebAXEnums.h
 // until the Chromium and Blink trees are merged.
 [camel_case_enum_to_string=true] namespace ui {
 
   // For new entries to the following three enums, also add to
   // chrome/common/extensions/api/automation.idl.

[dmazzoni, 2015/03/30 13:40:16]

Don't forget to modify automation.idl too

   //
   // Explanation of the comments next to these events:
   //
   // Web: this event is only used in web content. Unless a specific platform
   //      is specified, it fires a native event on multiple platforms.
   //
   // Native: this event is only used in native UI.
   //
   // Implicit: it would be cleaner if we just updated the AX node
   //     and each platform fired the appropriate events to indicate which
@@ skipping 180 matching lines @@
     enabled,   // content only
     expanded,
     focusable,
     focused,
     haspopup,
     horizontal,
     hovered,
     indeterminate,
     invisible,
     linked,
+    multiline,
     multiselectable,
     offscreen,
     pressed,
     protected,
     read_only,
     required,
     selectable,
     selected,
     vertical,
     visited
@@ skipping 191 matching lines @@
   };
 
   [cpp_enum_prefix_override="ax"] enum AXSortDirection {
     sort_direction_unsorted,
     sort_direction_ascending,
     sort_direction_descending,
     sort_direction_other
   };
 
 };