Add an accessibility description for notification

chrome/common/extensions/api/automation.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.
 
 // The <code>chrome.automation</code> API allows developers to access the
 // automation (accessibility) tree for the browser. The tree resembles the DOM
 // tree, but only exposes the <em>semantic</em> structure of a page. It can be
 // used to programmatically interact with a page by examining names, roles, and
 // states, listening for events, and performing actions on nodes.
 [nocompile] namespace automation {
@@ skipping 127 matching lines @@
     menuButton,
     menuItem,
     menuItemCheckBox,
     menuItemRadio,
     menuListOption,
     menuListPopup,
     menu,
     meter,
     navigation,
     note,
+    notification,

[yawano, 2017/06/02 04:56:51]

Please update the extern file by running the script. Note that there is already
some diff between the script output and current extern file. It's up to you to
fix other diffs or not.

https://cs.chromium.org/chromium/src/third_party/closure_compiler/externs/aut...

     outline,
     pane,
     paragraph,
     popUpButton,
     pre,
     presentational,
     progressIndicator,
     radioButton,
     radioGroup,
     region,
@@ skipping 647 matching lines @@
     // Everything in the tree between the two node/offset pairs gets included
     // in the selection. The anchor is where the user started the selection,
     // while the focus is the point at which the selection gets extended
     // e.g. when dragging with a mouse or using the keyboard. For nodes with
     // the role staticText, the offset gives the character offset within
     // the value where the selection starts or ends, respectively.
     [nocompile] static void setDocumentSelection(
         SetDocumentSelectionParams params);
   };
 };