[ash-md] Add on-screen keyboard toggle row in IME menu view.

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.
 
 action("aggregate_vector_icons") {
   visibility = [ ":*" ]
 
   script = "//ui/gfx/vector_icons/aggregate_vector_icons.py"
 
   icons = [
     "ime_menu_emoticon.1x.icon",
     "ime_menu_emoticon.icon",
     "ime_menu_microphone.1x.icon",
     "ime_menu_microphone.icon",
+    "ime_menu_on_screen_keyboard.1x.icon",
+    "ime_menu_on_screen_keyboard.icon",
     "ime_menu_write.1x.icon",
     "ime_menu_write.icon",
     "network_badge_add_other.1x.icon",
     "network_badge_add_other.icon",
     "network_badge_captive_portal.1x.icon",
     "network_badge_captive_portal.icon",
     "network_badge_roaming.1x.icon",
     "network_badge_roaming.icon",
     "network_badge_secure.1x.icon",
     "network_badge_secure.icon",
@@ skipping 182 matching lines @@
 source_set("vector_icons") {
   sources = get_target_outputs(":aggregate_vector_icons")
   sources += [ "//ui/gfx/vector_icon_types.h" ]
 
   deps = [
     ":aggregate_vector_icons",
     "//base",
     "//skia",
   ]
 }