Add accessibility related notification to notification center

ash/resources/vector_icons/BUILD.gn

 # Copyright 2016 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.
 
 import("//ui/vector_icons/vector_icons.gni")
 
 aggregate_vector_icons("ash_vector_icons") {
   icon_directory = "."
 
   icons = [
@@ skipping 73 matching lines @@
     "shelf_notifications.1x.icon",
     "shelf_notifications.icon",
     "shelf_overflow.1x.icon",
     "shelf_overflow.icon",
     "shelf_overview.1x.icon",
     "shelf_overview.icon",
     "system_menu_accessibility.1x.icon",
     "system_menu_accessibility.icon",
     "system_menu_accessibility_auto_click.1x.icon",
     "system_menu_accessibility_auto_click.icon",
+    "system_menu_accessibility_braille.icon",

[tdanderson, 2017/05/08 21:55:27]

We use the system_menu_ prefix to describe icons that can be shown in the system
menu itself. Since this is only used within a notification, I suggest re-naming
as notification_braille.icon.

[yiyix, 2017/05/15 22:55:15]

Done.

     "system_menu_accessibility_chromevox.1x.icon",
     "system_menu_accessibility_chromevox.icon",
     "system_menu_accessibility_contrast.1x.icon",
     "system_menu_accessibility_contrast.icon",
     "system_menu_accessibility_large_cursor.1x.icon",
     "system_menu_accessibility_large_cursor.icon",
     "system_menu_accessibility_screen_magnifier.1x.icon",
     "system_menu_audio_input.icon",
     "system_menu_audio_input.1x.icon",
     "system_menu_audio_output.icon",
@@ skipping 137 matching lines @@
 source_set("vector_icons") {
   sources = get_target_outputs(":ash_vector_icons")
   sources += [ "//ui/gfx/vector_icon_types.h" ]
 
   deps = [
     ":ash_vector_icons",
     "//base",
     "//skia",
   ]
 }