[cros] Add --stub-cros-settings option for testing.

chrome/browser/chromeos/stub_cros_settings_provider.cc

+// Copyright (c) 2011 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/stub_cros_settings_provider.h"
+
+#include "base/logging.h"
+#include "base/values.h"
+#include "chrome/browser/chromeos/cros_settings.h"
+#include "chrome/browser/chromeos/cros_settings_names.h"
+#include "chrome/browser/chromeos/login/user_manager.h"
+
+namespace chromeos {
+
+namespace {
+
+const char* kHandledSettings[] = {
+  kAccountsPrefAllowGuest,
+  kAccountsPrefAllowNewUser,
+  kAccountsPrefShowUserNamesOnSignIn,
+  kAccountsPrefUsers,
+  kDeviceOwner,
+  kReleaseChannel,
+  kSettingProxyEverywhere,
+  kSignedDataRoamingEnabled,
+  kStatsReportingPref
+};
+
+}  // namespace
+
+StubCrosSettingsProvider::StubCrosSettingsProvider(
+    const NotifyObserversCallback& notify_cb)
+    : CrosSettingsProvider(notify_cb) {
+  SetDefaults();
+}
+
+StubCrosSettingsProvider::~StubCrosSettingsProvider() {
+}
+
+const base::Value* StubCrosSettingsProvider::Get(
+    const std::string& path) const {
+  DCHECK(HandlesSetting(path));
+  const base::Value* value;
+  if (values_.GetValue(path, &value))
+    return value;
+  return NULL;
+}
+
+bool StubCrosSettingsProvider::GetTrusted(const std::string& path,
+                                          const base::Closure& callback) {
+  // We don't have a trusted store so all values are available immediately.
+  return true;
+}
+
+bool StubCrosSettingsProvider::HandlesSetting(const std::string& path) const {
+  const char** end = kHandledSettings + arraysize(kHandledSettings);
+  return std::find(kHandledSettings, end, path) != end;
+}
+
+void StubCrosSettingsProvider::Reload() {
+}
+
+void StubCrosSettingsProvider::DoSet(const std::string& path,
+                                     const base::Value& value) {
+  values_.SetValue(path, value.DeepCopy());
+  NotifyObservers(path);
+}
+
+void StubCrosSettingsProvider::SetDefaults() {
+  values_.SetBoolean(kAccountsPrefAllowGuest, true);
+  values_.SetBoolean(kAccountsPrefAllowNewUser, true);
+  values_.SetBoolean(kAccountsPrefShowUserNamesOnSignIn, true);
+  // |kDeviceOwner| will be set to the logged-in user by |UserManager|.
+}
+
+}  // namespace chromeos