ChromeOS OOBE: fix focus flow in MD-OOBE.

chrome/browser/resources/chromeos/login/oobe_a11y_option.js

Index: chrome/browser/resources/chromeos/login/oobe_a11y_option.js
diff --git a/chrome/browser/resources/chromeos/login/oobe_a11y_option.js b/chrome/browser/resources/chromeos/login/oobe_a11y_option.js
index 08a24d8ce56299f8e3dc3bdea7cbf7413d4406b9..e1024804705dc4fbe09d6452f7578d5d74a9271f 100644
--- a/chrome/browser/resources/chromeos/login/oobe_a11y_option.js
+++ b/chrome/browser/resources/chromeos/login/oobe_a11y_option.js
@@ -23,6 +23,10 @@ Polymer({
     /**
      * ARIA-label for the button.
      */
-    ariaLabel: String,
+    label: String,

[stevenjb, 2017/02/14 01:21:32]

Why does this need to be renamed here and elsewhere? It seemed more clear
before.

[Alexander Alekseev, 2017/02/14 11:59:27]

Because otherwise it will become aria-label attribute of <oobe-a11y-option> tag
itself in addition to actual input element inside it. So ChromeVox will
pronounce it twice (sometimes).

[stevenjb, 2017/02/14 17:35:34]

I see. I'm not super fond of just 'label' for something that will only be used
for aria, maybe 'labelForAria'?

[Alexander Alekseev, 2017/02/14 23:41:17]

Done.

+  },
+
+  focus: function() {
+    this.$.button.focus();
   },
 });