[ChromeOS] Show autofill popup after keyboard (if any) is shown.

ui/base/ime/dummy_input_method.h

Index: ui/base/ime/dummy_input_method.h
diff --git a/ui/base/ime/dummy_input_method.h b/ui/base/ime/dummy_input_method.h
index edad7b8ff5054f75b59ce454b3080c50d2aa2f83..b36841fbe368e45208ed5d32f9b803091594a3f8 100644
--- a/ui/base/ime/dummy_input_method.h
+++ b/ui/base/ime/dummy_input_method.h
@@ -39,6 +39,8 @@ class DummyInputMethod : public InputMethod {
   bool CanComposeInline() const override;
   bool IsCandidatePopupOpen() const override;
   void ShowImeIfNeeded() override;
+  void SetSupportsOnScreenKeyboard(bool supports) override;
+  bool SupportsOnScreenKeyboard() const override;
 
   void AddObserver(InputMethodObserver* observer) override;
   void RemoveObserver(InputMethodObserver* observer) override;