Add desktop vs. ash context to ui_controls

ui/views/examples/content_client/examples_browser_main_parts.cc

Index: ui/views/examples/content_client/examples_browser_main_parts.cc
diff --git a/ui/views/examples/content_client/examples_browser_main_parts.cc b/ui/views/examples/content_client/examples_browser_main_parts.cc
index 2c371f1a3cd9c7b93c3f4611c59cfca63eb024b4..fb134062a15528831731f857d4a3df51af0c41f7 100644
--- a/ui/views/examples/content_client/examples_browser_main_parts.cc
+++ b/ui/views/examples/content_client/examples_browser_main_parts.cc
@@ -46,6 +46,8 @@ void ExamplesBrowserMainParts::PreMainMessageLoopRun() {
   aura::client::SetStackingClient(stacking_client_.get());
   gfx::Screen::SetScreenInstance(
       gfx::SCREEN_TYPE_NATIVE, CreateDesktopScreen());
+  ui_controls::UIControls::SetUIControlsInstance(
+      ui_controls::UI_CONTROLS_TYPE_NATIVE, CreateDesktopUIControls());
 #endif
   views_delegate_.reset(new DesktopTestViewsDelegate);