Add ManagedUserSharedSettingsService.

chrome/browser/managed_mode/managed_user_shared_settings_update.cc

Index: chrome/browser/managed_mode/managed_user_shared_settings_update.cc
diff --git a/chrome/browser/managed_mode/managed_user_shared_settings_update.cc b/chrome/browser/managed_mode/managed_user_shared_settings_update.cc
new file mode 100644
index 0000000000000000000000000000000000000000..721ca224a0ead6c3d3c0a749b300b786b951774c
--- /dev/null
+++ b/chrome/browser/managed_mode/managed_user_shared_settings_update.cc
@@ -0,0 +1,40 @@
+// 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 "chrome/browser/managed_mode/managed_user_shared_settings_update.h"
+
+#include "base/bind.h"
+#include "base/values.h"
+#include "chrome/browser/managed_mode/managed_user_shared_settings_service.h"
+
+ManagedUserSharedSettingsUpdate::ManagedUserSharedSettingsUpdate(
+    ManagedUserSharedSettingsService* service,
+    const std::string& mu_id,
+    const std::string& key,
+    scoped_ptr<base::Value> value,
+    const base::Callback<void(bool)>& success_callback)
+    : service_(service),
+      mu_id_(mu_id),
+      key_(key),
+      value_(value.Pass()),
+      callback_(success_callback) {
+  service->SetValueInternal(mu_id, key, *value_, false);
+  subscription_ = service->Subscribe(
+      base::Bind(&ManagedUserSharedSettingsUpdate::OnSettingChanged,
+                 base::Unretained(this)));
+}
+
+ManagedUserSharedSettingsUpdate::~ManagedUserSharedSettingsUpdate() {}
+
+void ManagedUserSharedSettingsUpdate::OnSettingChanged(const std::string& mu_id,
+                                                       const std::string& key) {
+  if (mu_id != mu_id_)
+    return;
+
+  if (key != key_)
+    return;
+
+  const base::Value* value = service_->GetValue(mu_id, key);
+  callback_.Run(value->Equals(value_.get()));
+}