Add DeviceADPolicyManager to provide AD policy.

chrome/browser/chromeos/policy/device_ad_policy_manager.cc

+// Copyright 2016 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/policy/device_ad_policy_manager.h"
+
+#include <utility>
+
+#include "base/memory/ptr_util.h"
+
+namespace policy {
+
+DeviceADPolicyManager::DeviceADPolicyManager(
+    std::unique_ptr<CloudPolicyStore> store)
+    : store_(std::move(store)) {}
+
+DeviceADPolicyManager::~DeviceADPolicyManager() {}
+
+void DeviceADPolicyManager::Init(SchemaRegistry* registry) {
+  ConfigurationPolicyProvider::Init(registry);
+
+  store_->AddObserver(this);
+  PublishPolicy();
+  if (!store_->is_initialized()) {
+    store_->Load();
+  }
+}
+
+void DeviceADPolicyManager::Shutdown() {
+  store_->RemoveObserver(this);
+  ConfigurationPolicyProvider::Shutdown();
+}
+
+bool DeviceADPolicyManager::IsInitializationComplete(
+    PolicyDomain domain) const {
+  if (domain == POLICY_DOMAIN_CHROME)
+    return store_->is_initialized();
+  return true;
+}
+
+void DeviceADPolicyManager::RefreshPolicies() {
+  store_->Load();
+}
+
+void DeviceADPolicyManager::OnStoreLoaded(
+    CloudPolicyStore* cloud_policy_store) {
+  DCHECK_EQ(store_.get(), cloud_policy_store);

[emaxx, 2016/11/11 15:25:08]

nit: #include "base/logging.h"

[Thiemo Nagel, 2016/11/16 19:11:01]

Done.

+  PublishPolicy();
+}
+
+void DeviceADPolicyManager::OnStoreError(CloudPolicyStore* cloud_policy_store) {
+  DCHECK_EQ(store_.get(), cloud_policy_store);
+  // Publish policy (even though it hasn't changed) in order to signal load
+  // complete on the ConfigurationPolicyProvider interface. Technically, this is
+  // only required on the first load, but doesn't hurt in any case.
+  PublishPolicy();
+}
+
+void DeviceADPolicyManager::PublishPolicy() {
+  if (!store_->is_initialized()) {
+    return;
+  }
+  std::unique_ptr<PolicyBundle> bundle = base::MakeUnique<PolicyBundle>();

[emaxx, 2016/11/11 15:25:08]

nit: #include "components/policy/core/common/policy_bundle.h"

[Thiemo Nagel, 2016/11/16 19:11:01]

Done.

+  PolicyMap& policy_map =
+      bundle->Get(PolicyNamespace(POLICY_DOMAIN_CHROME, std::string()));

[emaxx, 2016/11/11 15:25:08]

nit: #include <string>

[Thiemo Nagel, 2016/11/16 19:11:01]

Done.

+  policy_map.CopyFrom(store_->policy_map());
+
+  // Overwrite the source which is POLICY_SOURCE_CLOUD by default.
+  // TODO(tnagel): Rename CloudPolicyStore to PolicyStore and make the source

[emaxx, 2016/11/11 15:25:08]

Just a point from my perspective: there are other (non-cloud) policy providers,
data from which is not stored in CloudPolicyStore. So there's some value in
keeping this "cloud" word in CloudPolicyStore. And, maybe, having this thing in
mind, the DeviceADPolicyManager also should have the word "cloud" in it?
Not sure though.

[Thiemo Nagel, 2016/11/16 19:11:01]

AD is not cloud, very often it's on-premise servers.  Thus I don't think it
would be correct to call it cloud.  And since the "CloudPolicyStore" is now used
by something that's non-cloud, I guess we should drop the "Cloud" from the name.
 (Also makes it shorter.)

+  // configurable, then drop PolicyMap::SetSourceForAll().
+  policy_map.SetSourceForAll(POLICY_SOURCE_ACTIVE_DIRECTORY);

[emaxx, 2016/11/11 15:25:08]

nit: #include "components/policy/core/common/policy_types.h"

[Thiemo Nagel, 2016/11/16 19:11:01]

Done.

+  UpdatePolicy(std::move(bundle));
+}
+
+}  // namespace policy