aura: Add RootWindowObserver::OnKeyboardMappingChanged().

ui/aura/dispatcher_linux.cc

 // Copyright (c) 2012 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/aura/dispatcher_linux.h"
 
 #include <X11/extensions/XInput2.h>
 
 #include "ui/base/events.h"
 
@@ skipping 19 matching lines @@
 
 base::MessagePumpDispatcher::DispatchStatus DispatcherLinux::Dispatch(
     XEvent* xev) {
   // XI_HierarchyChanged events are special. There is no window associated with
   // these events. So process them directly from here.
   if (xev->type == GenericEvent &&
       xev->xgeneric.evtype == XI_HierarchyChanged) {
     ui::UpdateDeviceList();
     return EVENT_PROCESSED;
   }
+
+  // MappingNotify events (meaning that the keyboard or pointer buttons have
+  // been remapped) aren't associated with a window; send them to all
+  // dispatchers.
+  if (xev->type == MappingNotify) {
+    for (DispatchersMap::const_iterator it = dispatchers_.begin();
+         it != dispatchers_.end(); ++it) {
+      it->second->Dispatch(xev);
+    }
+    return EVENT_PROCESSED;
+  }
+
   MessageLoop::Dispatcher* dispatcher = GetDispatcherForXEvent(xev);
   return dispatcher ? dispatcher->Dispatch(xev) : EVENT_IGNORED;
 }
 
 MessageLoop::Dispatcher* DispatcherLinux::GetDispatcherForXEvent(
     XEvent* xev) const {
   ::Window window = xev->xany.window;
   if (xev->type == GenericEvent) {
     XIDeviceEvent* xievent = static_cast<XIDeviceEvent*>(xev->xcookie.data);
     window = xievent->event;
   }
   DispatchersMap::const_iterator it = dispatchers_.find(window);
   return it != dispatchers_.end() ? it->second : NULL;
 }
 
 MessageLoop::Dispatcher* CreateDispatcher() {
   return new DispatcherLinux;
 }
 
 }  // namespace aura