Make touch accessibility gestures work with ChromeVox Next

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.
@@ skipping 438 matching lines @@
     name_from_value
   };
 
   [cpp_enum_prefix_override="ax"] enum AXDescriptionFrom {
     description_from_uninitialized = 0,
     description_from_attribute,
     description_from_contents,
     description_from_placeholder,
     description_from_related_element
   };
+
+  // Touch gestures on Chrome OS.
+  enum AXGesture {
+    swipe_left_1,
+    swipe_up_1,
+    swipe_right_1,
+    swipe_down_1,
+    swipe_left_2,
+    swipe_up_2,
+    swipe_right_2,
+    swipe_down_2,
+    swipe_left_3,
+    swipe_up_3,
+    swipe_right_3,
+    swipe_down_3,
+    swipe_left_4,
+    swipe_up_4,
+    swipe_right_4,
+    swipe_down_4,
+  };
 };