Add DeviceADPolicyManager to provide AD policy.

chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h

Index: chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h
diff --git a/chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h b/chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h
index 608a718aa0404f079cba91a6cc76f374381ca3ac..c708998051606478e508da9515372eb6b5c7b08f 100644
--- a/chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h
+++ b/chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h
@@ -39,6 +39,7 @@ class AffiliatedCloudPolicyInvalidator;
 class AffiliatedInvalidationServiceProvider;
 class AffiliatedRemoteCommandsInvalidator;
 class BluetoothPolicyHandler;
+class DeviceActiveDirectoryPolicyManager;
 class DeviceCloudPolicyInitializer;
 class DeviceLocalAccountPolicyService;
 class DeviceManagementService;
@@ -75,6 +76,8 @@ class BrowserPolicyConnectorChromeOS
   // Returns the enterprise domain if device is managed.
   std::string GetEnterpriseDomain() const;
 
+  // Returns the Kerberos realm (aka Windows Domain) if the device is managed by
+  // Active Directory.
   std::string GetRealm() const;
 
   // Returns the device asset ID if it is set.
@@ -94,14 +97,23 @@ class BrowserPolicyConnectorChromeOS
   // for details.
   EnrollmentConfig GetPrescribedEnrollmentConfig() const;
 
+  // May be nullptr, e.g. for devices managed by Active Directory.
   DeviceCloudPolicyManagerChromeOS* GetDeviceCloudPolicyManager() const {
     return device_cloud_policy_manager_;
   }
 
+  // May be nullptr, e.g. for cloud-managed devices.
+  DeviceActiveDirectoryPolicyManager* GetDeviceActiveDirectoryPolicyManager()
+      const {
+    return device_active_directory_policy_manager_;
+  }
+
+  // May be nullptr, e.g. for devices managed by Active Directory.
   DeviceCloudPolicyInitializer* GetDeviceCloudPolicyInitializer() const {
     return device_cloud_policy_initializer_.get();
   }
 
+  // May be nullptr, e.g. for devices managed by Active Directory.
   DeviceLocalAccountPolicyService* GetDeviceLocalAccountPolicyService() const {
     return device_local_account_policy_service_.get();
   }
@@ -110,6 +122,7 @@ class BrowserPolicyConnectorChromeOS
     return install_attributes_.get();
   }
 
+  // May be nullptr, e.g. for devices managed by Active Directory.
   ServerBackedStateKeysBroker* GetStateKeysBroker() const {
     return state_keys_broker_.get();
   }
@@ -163,8 +176,10 @@ class BrowserPolicyConnectorChromeOS
   std::unique_ptr<chromeos::InstallAttributes> install_attributes_;
   std::unique_ptr<AffiliatedInvalidationServiceProvider>
       affiliated_invalidation_service_provider_;
-  DeviceCloudPolicyManagerChromeOS* device_cloud_policy_manager_;
-  PrefService* local_state_;
+  DeviceCloudPolicyManagerChromeOS* device_cloud_policy_manager_ = nullptr;
+  DeviceActiveDirectoryPolicyManager* device_active_directory_policy_manager_ =
+      nullptr;
+  PrefService* local_state_ = nullptr;
   std::unique_ptr<DeviceCloudPolicyInitializer>
       device_cloud_policy_initializer_;
   std::unique_ptr<DeviceLocalAccountPolicyService>
@@ -182,7 +197,7 @@ class BrowserPolicyConnectorChromeOS
   // after login.
   // The provider is owned by the base class; this field is just a typed weak
   // pointer to get to the ProxyPolicyProvider at SetUserPolicyDelegate().
-  ProxyPolicyProvider* global_user_cloud_policy_provider_;
+  ProxyPolicyProvider* global_user_cloud_policy_provider_ = nullptr;
 
   std::unique_ptr<NetworkConfigurationUpdater> network_configuration_updater_;