[IME] Loads chromeos-xkb extension and add the extension based xkb keyboards in the chrome://settin…

chromeos/ime/extension_ime_util.cc

 // Copyright 2013 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 "chromeos/ime/extension_ime_util.h"
 
 #include "base/strings/string_util.h"
 
 namespace chromeos {
 namespace {
 const char kExtensionIMEPrefix[] = "_ext_ime_";
 const int kExtensionIMEPrefixLength =
     sizeof(kExtensionIMEPrefix) / sizeof(kExtensionIMEPrefix[0]) - 1;
 const char kComponentExtensionIMEPrefix[] = "_comp_ime_";
+const char kExtensionXkbIdPrefix[] =
+    "_comp_ime_fgoepimhcoialccpbmpnnblemnepkkao";
 const int kComponentExtensionIMEPrefixLength =
     sizeof(kComponentExtensionIMEPrefix) /
         sizeof(kComponentExtensionIMEPrefix[0]) - 1;
 const int kExtensionIdLength = 32;
 }  // namespace
 
 namespace extension_ime_util {
 std::string GetInputMethodID(const std::string& extension_id,
                              const std::string& engine_id) {
   DCHECK(!extension_id.empty());
@@ skipping 37 matching lines @@
                          true);  // Case sensitive.
 }
 
 bool IsMemberOfExtension(const std::string& input_method_id,
                          const std::string& extension_id) {
   return StartsWithASCII(input_method_id,
                          kExtensionIMEPrefix + extension_id,
                          true);  // Case sensitive.
 }
 
+bool IsKeyboardLayoutExtension(const std::string& input_method_id) {
+  return StartsWithASCII(input_method_id, kExtensionXkbIdPrefix, true);
+}
+
 }  // namespace extension_ime_util
 }  // namespace chromeos