[IME] migrate the xkb ID to extension based xkb ID.

chrome/browser/chromeos/preferences.cc

Index: chrome/browser/chromeos/preferences.cc
diff --git a/chrome/browser/chromeos/preferences.cc b/chrome/browser/chromeos/preferences.cc
index 16566b844bb7fc62ffcf0bc5f45afeeafde7e2c1..44048d6723273eddf36d191671ea5cd9e9fcc8ca 100644
--- a/chrome/browser/chromeos/preferences.cc
+++ b/chrome/browser/chromeos/preferences.cc
@@ -33,6 +33,7 @@
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chromeos/chromeos_switches.h"
+#include "chromeos/ime/extension_ime_util.h"
 #include "chromeos/ime/input_method_manager.h"
 #include "chromeos/ime/xkeyboard.h"
 #include "chromeos/system/statistics_provider.h"
@@ -582,6 +583,12 @@ void Preferences::SetLanguageConfigStringListAsCSV(const char* section,
   if (!value.empty())
     base::SplitString(value, ',', &split_values);
 
+  // TODO(shuchen): migration of the xkb id to extension-xkb id.
+  // Remove this function after few milestones are passed.
+  // See: http://crbug.com/345604
+  if (input_method_manager_->MigrateXkbInputMethods(&split_values))
+    preload_engines_.SetValue(JoinString(split_values, ','));
+
   if (section == std::string(language_prefs::kGeneralSectionName) &&
       name == std::string(language_prefs::kPreloadEnginesConfigName)) {
     input_method_manager_->ReplaceEnabledInputMethods(split_values);