MD Bookmarks: Announce to screen readers when search results are available

Bug: 735808
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I9449bca20368229dbe9c6e4860ad2ba0467fd0d8
Reviewed-on: https://chromium-review.googlesource.com/567898Reviewed-by: calamity <calamity@chromium.org>
Commit-Queue: Tim Sergeant <tsergeant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487413}

chrome/app/bookmarks_strings.grdp

@@ -425,6 +425,9 @@
   <message name="IDS_MD_BOOKMARK_MANAGER_ITEMS_SELECTED" desc="Label displayed in bookmark manager toolbar telling the user how many items they have selected.">
     <ph name="NUMBER_OF_ITEMS_SELECTED">$1</ph> selected
   </message>
+  <message name="IDS_MD_BOOKMARK_MANAGER_SEARCH_RESULTS" desc="Message announced by screenreaders when search results are found.">
+    Search results for '<ph name="SEARCH_STRING">$1<ex>reading</ex></ph>'
+  </message>
   <message name="IDS_MD_BOOKMARK_MANAGER_TITLE" desc="Title of the bookmark manager window.">
     Bookmarks
   </message>

chrome/browser/resources/md_bookmarks/app.js

@@ -122,6 +122,11 @@ Polymer({
         return node.id;
       });
       this.dispatch(bookmarks.actions.setSearchResults(ids));
+      this.fire('iron-announce', {
+        text: ids.length > 0 ?
+            loadTimeData.getStringF('searchResults', this.searchTerm_) :
+            loadTimeData.getString('noSearchResults')
+      });
     }.bind(this));
   },
 

chrome/browser/resources/md_bookmarks/compiled_resources2.gyp

@@ -27,6 +27,7 @@
     {
       'target_name': 'app',
       'dependencies': [
+        '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:load_time_data',
         '<(DEPTH)/ui/webui/resources/js/cr/ui/compiled_resources2.gyp:splitter',
         '<(EXTERNS_GYP):chrome_extensions',
         'api_listener',

chrome/browser/ui/webui/md_bookmarks/md_bookmarks_ui.cc

@@ -99,6 +99,8 @@ content::WebUIDataSource* CreateMdBookmarksUIHTMLSource(Profile* profile) {
                      IDS_MD_BOOKMARK_MANAGER_FOLDER_RENAME_TITLE);
   AddLocalizedString(source, "searchPrompt",
                      IDS_BOOKMARK_MANAGER_SEARCH_BUTTON);
+  AddLocalizedString(source, "searchResults",
+                     IDS_MD_BOOKMARK_MANAGER_SEARCH_RESULTS);
   AddLocalizedString(source, "saveEdit", IDS_SAVE);
   AddLocalizedString(source, "title", IDS_MD_BOOKMARK_MANAGER_TITLE);
   AddLocalizedString(source, "toastFolderSorted",