Improve Play Store app search accessibility.

Change the accessibility rating text to the way Play Store is using.

Bug: 756991
Change-Id: I812faf2e74233ba7f7d1407bea19e00bfbf538b9
Reviewed-on: https://chromium-review.googlesource.com/667785
Commit-Queue: Jiaquan He <hejq@google.com>
Reviewed-by: Vadim Tryshev <vadimt@chromium.org>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505068}

ui/app_list/views/search_result_tile_item_list_view_unittest.cc

@@ -170,7 +170,7 @@ TEST_P(SearchResultTileItemListViewTest, Basic) {
         ->child_at(first_child + i * child_step)
         ->GetAccessibleNodeData(&node_data);
     EXPECT_EQ(ui::AX_ROLE_BUTTON, node_data.role);
-    EXPECT_EQ(base::StringPrintf("PlayStoreApp %d, %d.0, Price %d",
+    EXPECT_EQ(base::StringPrintf("PlayStoreApp %d, Star rating %d.0, Price %d",
                                  i - kInstalledApps, i + 1 - kInstalledApps,
                                  i - kInstalledApps),
               node_data.GetStringAttribute(ui::AX_ATTR_NAME));

ui/app_list/views/search_result_tile_item_view.cc

@@ -13,7 +13,9 @@
 #include "ui/app_list/search_result.h"
 #include "ui/app_list/vector_icons/vector_icons.h"
 #include "ui/app_list/views/search_result_container_view.h"
+#include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/paint_vector_icon.h"
+#include "ui/strings/grit/ui_strings.h"
 #include "ui/views/background.h"
 #include "ui/views/controls/image_view.h"
 #include "ui/views/controls/label.h"
@@ -161,8 +163,12 @@ void SearchResultTileItemView::SetSearchResult(SearchResult* item) {
   }
 
   base::string16 accessible_name = title()->text();
-  if (rating_ && rating_->visible())
-    accessible_name += base::UTF8ToUTF16(", ") + rating_->text();
+  if (rating_ && rating_->visible()) {
+    accessible_name +=
+        base::UTF8ToUTF16(", ") +
+        l10n_util::GetStringFUTF16(IDS_APP_ACCESSIBILITY_STAR_RATING_ARC,
+                                   rating_->text());
+  }
   if (price_ && price_->visible())
     accessible_name += base::UTF8ToUTF16(", ") + price_->text();
   SetAccessibleName(accessible_name);

ui/strings/ui_strings.grd

@@ -734,6 +734,9 @@ need to be translated for each locale.-->
       <message name="IDS_APP_LIST_PAGE_SWITCHER" desc="Tooltip for page switcher for each page in fullscreen view which shows all apps.">
         Page <ph name="selected_page">$1<ex>1</ex></ph> of <ph name="total_page_num">$2<ex>3</ex></ph>
       </message>
+      <message name="IDS_APP_ACCESSIBILITY_STAR_RATING_ARC" desc="Accessibility text for the start rating of a Play Store app.">
+        Star rating <ph name="RATING_SCORE">$1<ex>5.0</ex></ph>
+      </message>
 
       <!-- Strings describing the touch calibration UX -->
       <message name="IDS_DISPLAY_TOUCH_CALIBRATION_EXIT_LABEL" desc="A message to notify the user about using the escape key to exit the calibration mode.">