Disable pinch-to-zoom gesture on virtual keyboard

ui/keyboard/keyboard_controller.h

Index: ui/keyboard/keyboard_controller.h
diff --git a/ui/keyboard/keyboard_controller.h b/ui/keyboard/keyboard_controller.h
index 2bfe473f19d4b875dcb8b1192dc932a91f3d89dd..25369939bf8eef99235394d8d6988713ad17484b 100644
--- a/ui/keyboard/keyboard_controller.h
+++ b/ui/keyboard/keyboard_controller.h
@@ -14,6 +14,7 @@
 #include "ui/base/ime/input_method_observer.h"
 #include "ui/base/ime/text_input_type.h"
 #include "ui/gfx/geometry/rect.h"
+#include "ui/keyboard/keyboard_event_filter.h"
 #include "ui/keyboard/keyboard_export.h"
 #include "ui/keyboard/keyboard_layout_delegate.h"
 
@@ -177,6 +178,7 @@ class KEYBOARD_EXPORT KeyboardController : public ui::InputMethodObserver,
   bool keyboard_locked_;
   KeyboardMode keyboard_mode_;
   ui::TextInputType type_;
+  KeyboardEventFilter event_filter_;
 
   base::ObserverList<KeyboardControllerObserver> observer_list_;