Absence of keyboard layout is fatal.

ui/events/ozone/layout/xkb/xkb_keyboard_layout_engine.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/ozone/layout/xkb/xkb_keyboard_layout_engine.h"
 
 #include <xkbcommon/xkbcommon-names.h>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 634 matching lines @@
   xkb_context_include_path_append(context.get(), "/usr/share/X11/xkb");
   scoped_ptr<xkb_keymap, XkbKeymapDeleter> keymap;
   keymap.reset(xkb_keymap_new_from_names(context.get(), &names,
                                          XKB_KEYMAP_COMPILE_NO_FLAGS));
   if (keymap) {
     scoped_ptr<char, base::FreeDeleter> keymap_str(
         xkb_keymap_get_as_string(keymap.get(), XKB_KEYMAP_FORMAT_TEXT_V1));
     reply_runner->PostTask(FROM_HERE, base::Bind(reply_callback, layout_name,
                                                  base::Passed(&keymap_str)));
   } else {
-    LOG(ERROR) << "Keymap file failed to load: " << layout_name;
+    LOG(FATAL) << "Keymap file failed to load: " << layout_name;
   }
 }
 #endif
 
 }  // anonymous namespace
 
 XkbKeyCodeConverter::XkbKeyCodeConverter() {
 }
 
 XkbKeyCodeConverter::~XkbKeyCodeConverter() {
@@ skipping 57 matching lines @@
     scoped_ptr<char, base::FreeDeleter> keymap_str) {
   if (keymap_str) {
     xkb_keymap* keymap = xkb_map_new_from_string(
         xkb_context_.get(), keymap_str.get(), XKB_KEYMAP_FORMAT_TEXT_V1,
         XKB_KEYMAP_COMPILE_NO_FLAGS);
     XkbKeymapEntry entry = {layout_name, keymap};
     xkb_keymaps_.push_back(entry);
     if (layout_name == current_layout_name_)
       SetKeymap(keymap);
   } else {
-    LOG(ERROR) << "Keymap file failed to load: " << layout_name;
+    LOG(FATAL) << "Keymap file failed to load: " << layout_name;
   }
 }
 
 bool XkbKeyboardLayoutEngine::UsesISOLevel5Shift() const {
   // NOTIMPLEMENTED();
   return false;
 }
 
 bool XkbKeyboardLayoutEngine::UsesAltGr() const {
   // NOTIMPLEMENTED();
@@ skipping 212 matching lines @@
     if (close_index == std::string::npos)
       close_index = layout_name.size();
     *layout_variant = layout_name.substr(parentheses_index + 1,
                                          close_index - parentheses_index - 1);
   } else if (dash_index != std::string::npos) {
     *layout_id = layout_name.substr(0, dash_index);
     *layout_variant = layout_name.substr(dash_index + 1);
   }
 }
 }  // namespace ui