Keyboard Lock Host implementation

ui/events/platform/x11/x11_event_source.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/events/platform/x11/x11_event_source.h"
 
 #include <X11/Xatom.h>
 #include <X11/XKBlib.h>
 #include <X11/Xlib.h>
 
@@ skipping 220 matching lines @@
 
 void X11EventSource::ExtractCookieDataDispatchEvent(XEvent* xevent) {
   bool have_cookie = false;
   if (xevent->type == GenericEvent &&
       XGetEventData(xevent->xgeneric.display, &xevent->xcookie)) {
     have_cookie = true;
   }
 
   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;
 
   if (have_cookie)
     XFreeEventData(xevent->xgeneric.display, &xevent->xcookie);
 }
 
 void X11EventSource::PostDispatchEvent(XEvent* xevent) {
   bool should_update_device_list = false;
@@ skipping 42 matching lines @@
 }
 
 void X11EventSource::OnDispatcherListChanged() {
   if (!hotplug_event_handler_) {
     hotplug_event_handler_.reset(new X11HotplugEventHandler());
     // Force the initial device query to have an update list of active devices.
     hotplug_event_handler_->OnHotplugEvent();
   }
 }
 
+void X11EventSource::set_platform_key_event_filter(
+    keyboard_lock::PlatformKeyEventFilter* filter) {
+  filter_ = filter;
+}
+
 }  // namespace ui