Fix cropped floating gesture candidate window

ui/keyboard/keyboard_controller_proxy.h

Index: ui/keyboard/keyboard_controller_proxy.h
diff --git a/ui/keyboard/keyboard_controller_proxy.h b/ui/keyboard/keyboard_controller_proxy.h
index 98051fa248c74b8703ae3c1b53c15e94e48563c7..dc885e7572a2230742447cc07da279c17f81cc76 100644
--- a/ui/keyboard/keyboard_controller_proxy.h
+++ b/ui/keyboard/keyboard_controller_proxy.h
@@ -62,6 +62,11 @@ class KEYBOARD_EXPORT KeyboardControllerProxy : public aura::WindowObserver {
   // WebContent so we can just check if the WebContent is created or not.
   virtual bool HasKeyboardWindow() const;
 
+  // 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;
+
   // Gets the InputMethod that will provide notifications about changes in the
   // text input context.
   virtual ui::InputMethod* GetInputMethod() = 0;