Extract a delegate interface from c/b/input_method to permit decoupling from c/b.

chrome/browser/chromeos/input_method/input_method_delegate_impl.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 "chrome/browser/chromeos/input_method/input_method_delegate_impl.h"
+
+#include "base/prefs/public/pref_service_base.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/chromeos/language_preferences.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/common/pref_names.h"
+
+namespace chromeos {
+namespace input_method {
+
+InputMethodDelegateImpl::InputMethodDelegateImpl() {}
+
+void InputMethodDelegateImpl::SetSystemInputMethod(
+    const std::string& input_method) {
+  if (g_browser_process) {
+    PrefServiceBase* local_state = g_browser_process->local_state();
+    if (local_state) {
+      local_state->SetString(language_prefs::kPreferredKeyboardLayout,
+                             input_method);
+      return;
+    }
+  }
+
+  NOTREACHED();
+}
+
+void InputMethodDelegateImpl::SetUserInputMethod(
+    const std::string& input_method) {
+  PrefServiceBase* user_prefs = NULL;
+  Profile* profile = ProfileManager::GetDefaultProfile();
+  if (profile)
+    user_prefs = profile->GetPrefs();
+  if (!user_prefs)
+    return;
+
+  const std::string current_input_method_on_pref =
+      user_prefs->GetString(prefs::kLanguageCurrentInputMethod);
+  if (current_input_method_on_pref == input_method)
+    return;
+
+  user_prefs->SetString(prefs::kLanguagePreviousInputMethod,
+                        current_input_method_on_pref);
+  user_prefs->SetString(prefs::kLanguageCurrentInputMethod,
+                        input_method);
+}
+
+std::string InputMethodDelegateImpl::GetHardwareKeyboardLayout() const {
+  if (g_browser_process) {
+    PrefServiceBase* local_state = g_browser_process->local_state();
+    if (local_state)
+      return local_state->GetString(prefs::kHardwareKeyboardLayout);
+  }
+  // This shouldn't happen but just in case.
+  DVLOG(1) << "Local state is not yet ready.";
+  return std::string();
+}
+
+std::string InputMethodDelegateImpl::GetActiveLocale() const {
+  if (g_browser_process)
+    return g_browser_process->GetApplicationLocale();
+
+  NOTREACHED();
+  return std::string();
+}
+
+}  // namespace input_method
+}  // namespace chromeos