cros: Add aria label for fingerprint delete icon

Bug: 881430
Change-Id: Ib8488e23e388d15c006b66d38e9084cfc93c6c70
Reviewed-on: https://chromium-review.googlesource.com/1222198Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Xiaoyin Hu <xiaoyinh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591168}

chrome/app/settings_strings.grdp

@@ -3329,6 +3329,9 @@
     <message name="IDS_SETTINGS_PEOPLE_LOCK_SCREEN_FINGERPRINT_LESS_SECURE" desc="Text telling users that fingerprints might be less secure than strong PINs or passwords.">
       Note: Your fingerprint may be less secure than a strong password or PIN.
     </message>
+    <message name="IDS_SETTINGS_PEOPLE_LOCK_SCREEN_DELETE_FINGERPRINT_ARIA_LABEL" desc="Aria label for the button in the fingerprint subpage that deletes a registered fingerprint. Only visible by screen reader software.">
+      delete [<ph name="FINGERPRINT_NAME">$1<ex>Fingerprint 1</ex></ph>], button
+    </message>
     <message name="IDS_SETTINGS_PEOPLE_LOCK_SCREEN_NEW_FINGERPRINT_DEFAULT_NAME" desc="The default name (plus a number for a newly added fingerprint).">
       Finger <ph name="NEW_FINGER_NUMBER">$1<ex>1</ex></ph>
     </message>

chrome/browser/resources/settings/people_page/fingerprint_list.html

@@ -55,7 +55,9 @@
             <cr-input value="{{item}}" on-change="onFingerprintLabelChanged_">
             </cr-input>
             <paper-icon-button-light class="icon-delete-gray">
-              <button on-click="onFingerprintDeleteTapped_"></button>
+              <button on-click="onFingerprintDeleteTapped_"
+                  aria-label$="[[getButtonAriaLabel_(item)]]">
+              </button>
             </paper-icon-button-light>
           </div>
         </template>

chrome/browser/resources/settings/people_page/fingerprint_list.js

@@ -181,5 +181,14 @@ Polymer({
       this.onSetupFingerprintDialogClose_();
     }
   },
+
+  /**
+   * @param {string} item
+   * @return {string}
+   * @private
+   */
+  getButtonAriaLabel_: function(item) {
+    return this.i18n('lockScreenDeleteFingerprintLabel', item);
+  },
 });
 })();

chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.cc

@@ -1572,6 +1572,8 @@ void AddPeopleStrings(content::WebUIDataSource* html_source, Profile* profile) {
      IDS_SETTINGS_PEOPLE_LOCK_SCREEN_FINGERPRINT_SUBPAGE_TITLE},
     {"lockScreenFingerprintWarning",
      IDS_SETTINGS_PEOPLE_LOCK_SCREEN_FINGERPRINT_LESS_SECURE},
+    {"lockScreenDeleteFingerprintLabel",
+     IDS_SETTINGS_PEOPLE_LOCK_SCREEN_DELETE_FINGERPRINT_ARIA_LABEL},
     {"lockScreenNotificationHide",
      IDS_ASH_SETTINGS_LOCK_SCREEN_NOTIFICATION_HIDE},
     {"lockScreenNotificationHideSensitive",