update elements and fix some bugs

lib/paper_inky_focus_behavior.dart

Index: lib/paper_inky_focus_behavior.dart
diff --git a/lib/paper_inky_focus_behavior.dart b/lib/paper_inky_focus_behavior.dart
index 0672cc53857254f28058bdb95e23db108245903d..98cf3f322cdaaa5e5b182ee4f1fa19b8501ad98b 100644
--- a/lib/paper_inky_focus_behavior.dart
+++ b/lib/paper_inky_focus_behavior.dart
@@ -11,8 +11,9 @@ import 'package:polymer_interop/polymer_interop.dart';
 import 'iron_button_state.dart';
 import 'iron_a11y_keys_behavior.dart';
 import 'iron_control_state.dart';
+import 'paper_ripple_behavior.dart';
 
 /// `Polymer.PaperInkyFocusBehavior` implements a ripple when the element has keyboard focus.
 @BehaviorProxy(const ['Polymer', 'PaperInkyFocusBehavior'])
-abstract class PaperInkyFocusBehavior implements CustomElementProxyMixin, IronButtonState, IronControlState {
+abstract class PaperInkyFocusBehavior implements CustomElementProxyMixin, IronButtonState, IronControlState, PaperRippleBehavior {
 }