Fix cropped floating gesture candidate window

ui/keyboard/keyboard_controller_unittest.cc

Index: ui/keyboard/keyboard_controller_unittest.cc
diff --git a/ui/keyboard/keyboard_controller_unittest.cc b/ui/keyboard/keyboard_controller_unittest.cc
index 741e1d2d65bb9ca21eb636eacf2d99bf30a7a3ff..a999b2078d25801c46d24948ae5d1d8838ff2837 100644
--- a/ui/keyboard/keyboard_controller_unittest.cc
+++ b/ui/keyboard/keyboard_controller_unittest.cc
@@ -96,6 +96,9 @@ class TestKeyboardUI : public KeyboardUI {
 
   // Overridden from KeyboardUI:
   bool HasKeyboardWindow() const override { return window_; }
+  bool ShouldWindowOverscroll(aura::Window* window) const override {
+    return true;
+  }
   aura::Window* GetKeyboardWindow() override {
     if (!window_) {
       window_.reset(new aura::Window(&delegate_));