Live update for app list item view title colors.

ui/views/controls/label does not use themed colors from ash/style so
app_list_item_view should explicitly modify the color for title_.

Bug: 1139478
Change-Id: I590663a1c2e27c35f148a557017451c41d8db214
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627874
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843368}

ash/app_list/views/app_list_item_view.cc

@@ -896,6 +896,13 @@ void AppListItemView::OnGestureEvent(ui::GestureEvent* event) {
     Button::OnGestureEvent(event);
 }
 
+void AppListItemView::OnThemeChanged() {
+  views::Button::OnThemeChanged();
+  title_->SetEnabledColor(AppListColorProvider::Get()->GetAppListItemTextColor(
+      apps_grid_view_->is_in_folder()));
+  SchedulePaint();
+}
+
 base::string16 AppListItemView::GetTooltipText(const gfx::Point& p) const {
   // Use the label to generate a tooltip, so that it will consider its text
   // truncation in making the tooltip. We do not want the label itself to have a

ash/app_list/views/app_list_item_view.h

@@ -123,6 +123,7 @@ class APP_LIST_EXPORT AppListItemView : public views::Button,
 
   // views::Button overrides:
   void OnGestureEvent(ui::GestureEvent* event) override;
+  void OnThemeChanged() override;
 
   // views::View overrides:
   base::string16 GetTooltipText(const gfx::Point& p) const override;