Allow keys with AltGr modifier to be inserted in Textfield

ui/events/base_event_utils.cc

 // Copyright 2015 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/base_event_utils.h"
 
 #include "base/atomic_sequence_num.h"
 #include "base/logging.h"
 #include "ui/events/event_constants.h"
 
@@ skipping 16 matching lines @@
   // Set the first touch event ID to 1 because we set id to 0 for other types
   // of events.
   uint32 id = g_next_event_id.GetNext();
   if (id == 0)
     id = g_next_event_id.GetNext();
   DCHECK_NE(0U, id);
   return id;
 }
 
 bool IsSystemKeyModifier(int flags) {
-  return (kSystemKeyModifierMask & flags) != 0;
+  // AltGr modifier is used to type alternative keys on certain keyboard layouts
+  // so we don't consider keys with the AltGr modifier as a system key.
+  return (kSystemKeyModifierMask & flags) != 0 &&
+         (EF_ALTGR_DOWN & flags) == 0;
 }
 
 }  // namespace ui