Views a11y: Add AXNodeData.actions bitfield to indicate supported actions by UI.

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.
 
 // TODO(nektar): Migrate entire file to Mojoq.
 // 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 four enums, also add to
@@ skipping 452 matching lines @@
     container_live_busy,
     live_atomic,
     live_busy,
 
     // If a dialog box is marked as explicitly modal
     modal,
 
     // ARIA readonly flag.
     aria_readonly,
 
-    // Writeable attributes
-    can_set_value,
-
     // If this is set, all of the other fields in this struct should
     // be ignored and only the locations should change.
     update_location_only,
 
     // Set on a canvas element if it has fallback content.
     canvas_has_fallback
   };
 
   [cpp_enum_prefix_override="ax_attr"] enum AXIntListAttribute {
     // Ids of nodes that are children of this node logically, but are
@@ skipping 179 matching lines @@
     // First node is before the second one.
     before,
 
     // Nodes are the same.
     equal,
 
     // First node is after the second one.
     after
   };
 };