Keyboard Lock Host implementation

ui/events/platform/x11/x11_event_source.cc

Index: ui/events/platform/x11/x11_event_source.cc
diff --git a/ui/events/platform/x11/x11_event_source.cc b/ui/events/platform/x11/x11_event_source.cc
index f8bbaeb4d0b2e35173f0d5734d52baf1e7b3ef0e..b01c282e24d1f5b170bbb9e0c17eb845f8a7dd54 100644
--- a/ui/events/platform/x11/x11_event_source.cc
+++ b/ui/events/platform/x11/x11_event_source.cc
@@ -237,7 +237,11 @@ void X11EventSource::ExtractCookieDataDispatchEvent(XEvent* xevent) {
 
   dispatching_event_ = xevent;
 
-  delegate_->ProcessXEvent(xevent);
+  if (!filter_ || !filter_->OnPlatformEvent(xevent)) {
+    delegate_->ProcessXEvent(xevent);
+  } else {
+    LOG(ERROR) << "Block XEvent " << xevent;
+  }
   PostDispatchEvent(xevent);
 
   dispatching_event_ = nullptr;
@@ -300,4 +304,9 @@ void X11EventSource::OnDispatcherListChanged() {
   }
 }
 
+void X11EventSource::set_platform_key_event_filter(
+    keyboard_lock::PlatformKeyEventFilter* filter) {
+  filter_ = filter;
+}
+
 }  // namespace ui