End to end test: async focus shouldn't trigger virtual keyboard.

ui/keyboard/keyboard_controller.h

Index: ui/keyboard/keyboard_controller.h
diff --git a/ui/keyboard/keyboard_controller.h b/ui/keyboard/keyboard_controller.h
index 0018cc2df60ea7f4fe574f03cb45a0a5e242fc87..8cb30ea2417a0ac4227454b42acc1c021cb6f043 100644
--- a/ui/keyboard/keyboard_controller.h
+++ b/ui/keyboard/keyboard_controller.h
@@ -178,6 +178,7 @@ class KEYBOARD_EXPORT KeyboardController : public ui::InputMethodObserver,
                              const gfx::Rect& new_bounds) override;
 
   // InputMethodObserver overrides
+  void OnFocus() override {}
   void OnBlur() override {}
   void OnCaretBoundsChanged(const ui::TextInputClient* client) override {}
   void OnFocus() override {}