Fix cropped floating gesture candidate window

ash/test/test_keyboard_ui.cc

Index: ash/test/test_keyboard_ui.cc
diff --git a/ash/test/test_keyboard_ui.cc b/ash/test/test_keyboard_ui.cc
index b99266c2b7e2f3b179bf7d60de30b3d8131df7aa..67b6993875f39aaf81b7d4f2f7d24ef20437f58c 100644
--- a/ash/test/test_keyboard_ui.cc
+++ b/ash/test/test_keyboard_ui.cc
@@ -20,6 +20,10 @@ bool TestKeyboardUI::HasKeyboardWindow() const {
   return keyboard_;
 }
 
+bool TestKeyboardUI::ShouldWindowOverscroll(aura::Window* window) const {
+  return true;
+}
+
 aura::Window* TestKeyboardUI::GetKeyboardWindow() {
   if (!keyboard_) {
     keyboard_.reset(new aura::Window(&delegate_));