Fix cropped floating gesture candidate window

ui/keyboard/keyboard_ui.h

Index: ui/keyboard/keyboard_ui.h
diff --git a/ui/keyboard/keyboard_ui.h b/ui/keyboard/keyboard_ui.h
index 895617ffca09abbdf5d6d5abf7c03d9433f4529c..b4fc21c607f4428a06f7ebd3f6312a36521f33f9 100644
--- a/ui/keyboard/keyboard_ui.h
+++ b/ui/keyboard/keyboard_ui.h
@@ -36,6 +36,11 @@ class KEYBOARD_EXPORT KeyboardUI {
   // Whether the keyboard window has been created.
   virtual bool HasKeyboardWindow() const = 0;
 
+  // Whether this window should do an overscroll to avoid occlusion by the
+  // virtual keyboard. IME windows and virtual keyboard windows should always
+  // avoid overscroll.
+  virtual bool ShouldWindowOverscroll(aura::Window* window) const = 0;
+
   // Gets the InputMethod that will provide notifications about changes in the
   // text input context.
   virtual ui::InputMethod* GetInputMethod() = 0;