ChromeOS MD-OOBE: Add HID detection screen.

chrome/browser/resources/chromeos/login/oobe_hid_detection.css

+/* 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. */
+
+#continue-button-text {
+  text-transform: none;
+}
+
+#keyboard-icon,
+#mouse-icon {
+  height: 40px;
+  width: 40px;
+}
+
+#keyboard-tick,
+#mouse-tick {
+  -webkit-margin-start: -28px;
+  position: relative;
+  top: 4px; /* icon is 40x40, tick is 32x32, 4 = (40-32)/2 */
+}
+
+#hid-keyboard-pincode {
+  padding-bottom: 4px;
+};
+
+#hid-continue-button {
+  -webkit-padding-end: 18px;
+}
+
+.bottom-buttons {
+  padding: 0 6px; /* = 8px - 2px back button border */
+}
+
+.hid-selection-entry {
+  border-top: 1px solid lightgrey;
+  min-height: 44px;
+  padding: 0 20px;
+}
+
+.hid-selection-entry:last-of-type {
+  border-bottom: 1px solid lightgrey;
+}