ChromeOS OOBE: use old-style bubble for OOBE Accessibility popup.

ui/login/bubble.css

 /* 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.
  *
  * Css based bubble.
  */
 
 .bubble {
   -webkit-transition: opacity 200ms ease-in-out;
   background: rgba(0, 0, 0, 0.8);
   border-radius: 2px;
   color: rgba(255, 255, 255, 0.87);
   box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
   font-size: 12px;
   margin: 2px;
   max-width: 250px;
   padding: 8px;
   position: absolute;
 }
 
+/* --- oldstyle begin --- */
+
+.bubble[oldstyle] {
+  background: white;
+  border: 1px solid rgba(0, 0, 0, 0.25);
+  color: unset;
+}
+
+.bubble[oldstyle]::before {
+  border-style: solid;
+  border-width: 8px;
+  content: '';
+  display: block;
+  position: absolute;
+}
+
+.bubble-top::before {
+  border-color: rgba(0, 0, 0, 0.25) transparent transparent transparent;
+  bottom: -16px;
+}
+
+html[dir=ltr] .bubble-top::before {
+  left: 17px;
+}
+
+html[dir=rtl] .bubble-top::before {
+  right: 17px;
+}
+
+html[dir=ltr] .bubble-right::before,
+html[dir=rtl] .bubble-left::before {
+  border-color: transparent rgba(0, 0, 0, 0.25) transparent transparent;
+  left: -16px;
+  top: 17px;
+}
+
+.bubble-bottom::before {
+  border-color: transparent transparent rgba(0, 0, 0, 0.25) transparent;
+  top: -16px;
+}
+
+html[dir=ltr] .bubble-bottom::before {
+  left: 17px;
+}
+
+html[dir=rtl] .bubble-bottom::before {
+  right: 17px;
+}
+
+html[dir=ltr] .bubble-left::before,
+html[dir=rtl] .bubble-right::before {
+  border-color: transparent transparent transparent rgba(0, 0, 0, 0.25);
+  right: -16px;
+  top: 17px;
+}
+
+.bubble[oldstyle]::after {
+  border-style: solid;
+  border-width: 8px;
+  content: '';
+  display: block;
+  position: absolute;
+}
+
+.bubble-top::after {
+  border-color: white transparent transparent transparent;
+  bottom: -15px;
+}
+
+html[dir=ltr] .bubble-top::after {
+  left: 17px;
+}
+
+html[dir=rtl] .bubble-top::after {
+  right: 17px;
+}
+
+html[dir=ltr] .bubble-right::after,
+html[dir=rtl] .bubble-left::after {
+  border-color: transparent white transparent transparent;
+  left: -15px;
+  top: 17px;
+}
+
+.bubble-bottom::after {
+  border-color: transparent transparent white transparent;
+  top: -15px;
+}
+
+html[dir=ltr] .bubble-bottom::after {
+  left: 17px;
+}
+
+html[dir=rtl] .bubble-bottom::after {
+  right: 17px;
+}
+
+html[dir=ltr] .bubble-left::after,
+html[dir=rtl] .bubble-right::after {
+  border-color: transparent transparent transparent white;
+  right: -15px;
+  top: 17px;
+}
+
+/* --- oldstyle end --- */
+
 .error-message-bubble::before {
   -webkit-mask-image: url(../../ui/webui/resources/images/warning.svg);
   -webkit-mask-position: left top;
   -webkit-mask-repeat: no-repeat;
   -webkit-mask-size: 20px;
   background-color: rgb(255,255,255);
   content: '';
   display: block;
   height: 20px;
   left: 8px;
@@ skipping 16 matching lines @@
   text-decoration: none;
 }
 
 .error-message-bubble-padding {
   margin-bottom: 10px;
 }
 
 html[dir=rtl] .error-message-bubble {
   background-position: right top;
 }