Keyboard Lock Host implementation

ui/events/platform/x11/x11_event_source.h

Index: ui/events/platform/x11/x11_event_source.h
diff --git a/ui/events/platform/x11/x11_event_source.h b/ui/events/platform/x11/x11_event_source.h
index c2744906ab79517ae348e285d392855947dfa110..f0aef38608a21121a922a99fc2cacfdf813b8565 100644
--- a/ui/events/platform/x11/x11_event_source.h
+++ b/ui/events/platform/x11/x11_event_source.h
@@ -11,6 +11,7 @@
 
 #include "base/macros.h"
 #include "base/optional.h"
+#include "components/keyboard_lock/platform_key_event_filter.h"
 #include "ui/events/events_export.h"
 #include "ui/gfx/x/x11_types.h"
 
@@ -87,6 +88,9 @@ class EVENTS_EXPORT X11EventSource {
   void StopCurrentEventStream();
   void OnDispatcherListChanged();
 
+  void set_platform_key_event_filter(
+      keyboard_lock::PlatformKeyEventFilter* filter);
+
  protected:
   // Extracts cookie data from |xevent| if it's of GenericType, and dispatches
   // the event. This function also frees up the cookie data after dispatch is
@@ -127,6 +131,8 @@ class EVENTS_EXPORT X11EventSource {
 
   std::unique_ptr<X11HotplugEventHandler> hotplug_event_handler_;
 
+  keyboard_lock::PlatformKeyEventFilter* filter_ = nullptr;
+
   DISALLOW_COPY_AND_ASSIGN(X11EventSource);
 };