Introduce profile for lock screen apps

chrome/browser/policy/profile_policy_connector.cc

Index: chrome/browser/policy/profile_policy_connector.cc
diff --git a/chrome/browser/policy/profile_policy_connector.cc b/chrome/browser/policy/profile_policy_connector.cc
index a595184055a5f80411a9c776fccd7bb401a164a3..53c85a9848b0bbbff75f85121934c4e9b5207e8a 100644
--- a/chrome/browser/policy/profile_policy_connector.cc
+++ b/chrome/browser/policy/profile_policy_connector.cc
@@ -98,11 +98,12 @@ void ProfilePolicyConnector::Init(
 #if defined(OS_CHROMEOS)
   if (!user) {
     DCHECK(schema_registry);
-    // This case occurs for the signin profile.
+    // This case occurs for the signin and the lock screen app profiles.
     special_user_policy_provider_.reset(
         new LoginProfilePolicyProvider(connector->GetPolicyService()));
   } else {
-    // |user| should never be nullptr except for the signin profile.
+    // |user| should never be nullptr except for the signin and the lock screen
+    // app profile.
     is_primary_user_ =
         user == user_manager::UserManager::Get()->GetPrimaryUser();
     // Note that |DeviceLocalAccountPolicyProvider::Create| returns nullptr when
@@ -179,8 +180,8 @@ const CloudPolicyStore* ProfilePolicyConnector::GetActualPolicyStore() const {
     return policy_store_;
 #if defined(OS_CHROMEOS)
   if (special_user_policy_provider_) {
-    // |special_user_policy_provider_| is non-null for device-local accounts and
-    // for the login profile.
+    // |special_user_policy_provider_| is non-null for device-local accounts,
+    // for the login profile, and the lock screen app profile.
     const DeviceCloudPolicyManagerChromeOS* const device_cloud_policy_manager =
         g_browser_process->platform_part()
             ->browser_policy_connector_chromeos()