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 b27acd877ee1e734fbbe937a6b9abddf168fda24..dd13e8b769694691790a6f16b2f0e6fd5fec374d 100644
--- a/ui/events/platform/x11/x11_event_source.cc
+++ b/ui/events/platform/x11/x11_event_source.cc
@@ -238,7 +238,11 @@ 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;
@@ -301,4 +305,9 @@ void X11EventSource::OnDispatcherListChanged() {
   }
 }
 
+void X11EventSource::set_platform_key_event_filter(
+    keyboard_lock::PlatformKeyEventFilter* filter) {
+  filter_ = filter;
+}
+
 }  // namespace ui