Import Android SDK Platform PI [4335822]

/google/data/ro/projects/android/fetch_artifact \
    --bid 4335822 \
    --target sdk_phone_armv7-win_sdk \
    sdk-repo-linux-sources-4335822.zip

AndroidVersion.ApiLevel has been modified to appear as 28

Change-Id: Ic8f04be005a71c2b9abeaac754d8da8d6f9a2c32

com/android/server/PersistentDataBlockManagerInternal.java

diff --git a/com/android/server/PersistentDataBlockManagerInternal.java b/com/android/server/PersistentDataBlockManagerInternal.java
new file mode 100644
index 0000000..80f8e51
--- /dev/null
+++ b/com/android/server/PersistentDataBlockManagerInternal.java
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server;
+
+/**
+ * Internal interface for storing and retrieving persistent data.
+ */
+public interface PersistentDataBlockManagerInternal {
+
+    /** Stores the handle to a lockscreen credential to be used for Factory Reset Protection. */
+    void setFrpCredentialHandle(byte[] handle);
+
+    /** Retrieves handle to a lockscreen credential to be used for Factory Reset Protection. */
+    byte[] getFrpCredentialHandle();
+}