Live Updates for app list background shield.

Bug: 1139478
Change-Id: I9fd0a87bcc2086e27a5c4b3b6c025c2ff4065dbc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2623672
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842611}

ash/app_list/views/app_list_view.cc

@@ -869,6 +869,11 @@ void AppListView::Layout() {
   UpdateAppListBackgroundYPosition(app_list_state_);
 }
 
+void AppListView::OnThemeChanged() {
+  views::View::OnThemeChanged();
+  SetBackgroundShieldColor();
+}
+
 ax::mojom::Role AppListView::GetAccessibleWindowRole() {
   // Default role of root view is ax::mojom::Role::kWindow which traps ChromeVox
   // focus within the root view. Assign ax::mojom::Role::kGroup here to allow

ash/app_list/views/app_list_view.h

@@ -186,6 +186,7 @@ class APP_LIST_EXPORT AppListView : public views::WidgetDelegateView,
   const char* GetClassName() const override;
   bool AcceleratorPressed(const ui::Accelerator& accelerator) override;
   void Layout() override;
+  void OnThemeChanged() override;
 
   // WidgetDelegate:
   ax::mojom::Role GetAccessibleWindowRole() override;