OOBE: Update ARIA labels for GuestTos Screen

Bug: 1272308
Change-Id: I28e616f5b25144d28bfcc66a307b668c2634e2bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3294982
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Ossama Mahmoud <osamafathy@google.com>
Cr-Commit-Position: refs/heads/main@{#944075}
diff --git a/chrome/browser/resources/chromeos/login/screens/common/guest_tos.html b/chrome/browser/resources/chromeos/login/screens/common/guest_tos.html
index fa70075..ffca09f 100644
--- a/chrome/browser/resources/chromeos/login/screens/common/guest_tos.html
+++ b/chrome/browser/resources/chromeos/login/screens/common/guest_tos.html
@@ -110,16 +110,18 @@
         <!-- Usage stats toggle row -->
         <div class="layout horizontal center oobe-optin-row">
           <div class="oobe-optin-content">
-            <span class="oobe-optin-title">
+            <span id="usageTitle" class="oobe-optin-title">
               [[i18nDynamic(locale, 'guestTosUsageOptinTitle')]]
             </span>
             [[i18nDynamic(locale, 'guestTosUsageOptin')]]
             <a id="usageLearnMore" on-click="onUsageLearnMoreClick_"
-                class="oobe-local-link" is="action-link">
+                class="oobe-local-link" is="action-link"
+                aria-describedby="usageTitle">
               [[i18nDynamic(locale, 'guestTosLearnMore')]]
             </a>
           </div>
-          <cr-toggle id="usageOptin" checked="{{usageChecked}}">
+          <cr-toggle id="usageOptin" checked="{{usageChecked}}"
+              aria-describedby="usageTitle">
           </cr-toggle>
         </div>
       </div>