MD Extensions - A11y: Announce when an extension has been updated.

Bug: 27175
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I2fed4c16cf0406ea5361413840fe5ab2f5968f69
Reviewed-on: https://chromium-review.googlesource.com/1003056
Commit-Queue: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551142}

chrome/app/md_extensions_strings.grdp

@@ -78,6 +78,9 @@
   <message name="IDS_MD_EXTENSIONS_ITEM_DETAILS" desc="The text on the button to show more details for a given extension.">
     Details
   </message>
+  <message name="IDS_MD_EXTENSIONS_ITEM_RELOAD_DONE" desc="Text used to announce when a single extension has been updated. This is for accessibility.">
+    Extension reloaded
+  </message>
   <message name="IDS_MD_EXTENSIONS_EXTENSION_A11Y_ASSOCIATION" desc="Label used to associate an app or extension with actions a user can take. This label is for screen readers and will only be read out lout. Ex: a button labeled 'Delete' would have the description 'Related to AdBlock'. Without the added description a user on a screen reader would not have context of the extension they want to delete. Note that the action can be 'view details', 'enable', 'delete', 'errors', or something else.">
     Related to <ph name="NAME_PH">$1<ex>AdBlock</ex></ph>
   </message>

chrome/browser/resources/md_extensions/item.js

@@ -186,9 +186,18 @@ cr.define('extensions', function() {
           {page: Page.DETAILS, extensionId: this.data.id});
     },
 
-    /** @private */
-    onReloadTap_: function() {
-      this.delegate.reloadItem(this.data.id).catch(loadError => {
+    /**
+     * @param {Event} e
+     * @private
+     */
+    onReloadTap_: function(e) {
+      this.delegate.reloadItem(this.data.id)
+          .then(
+              () => {
+                Polymer.IronA11yAnnouncer.requestAvailability();
+                this.fire('iron-announce', {text: this.i18n('itemReloadDone')});
+              },
+              loadError => {
                 this.fire('load-error', loadError);
               });
     },

chrome/browser/ui/webui/extensions/extensions_ui.cc

@@ -202,6 +202,8 @@ content::WebUIDataSource* CreateMdExtensionsSource(bool in_dev_mode) {
   source->AddLocalizedString("itemDependentEntry",
                              IDS_MD_EXTENSIONS_DEPENDENT_ENTRY);
   source->AddLocalizedString("itemDetails", IDS_MD_EXTENSIONS_ITEM_DETAILS);
+  source->AddLocalizedString("itemReloadDone",
+                             IDS_MD_EXTENSIONS_ITEM_RELOAD_DONE);
   source->AddLocalizedString("itemErrors", IDS_MD_EXTENSIONS_ITEM_ERRORS);
   source->AddLocalizedString("accessibilityErrorLine",
                              IDS_MD_EXTENSIONS_ACCESSIBILITY_ERROR_LINE);