Update the Settings database to enable Payloads

Add Payload and Payload type columns to the settings
database. This includes extending preference controllers
to map their settings to UI components so that the
payload results can be consumed by a front end.

Change-Id: I889dcc4ff7793306718d12e1e5993386b58f21cc
Fixes: 33451851, 33390556
Test: RunSettingsRoboTests

src/com/android/settings/search2/ResultPayloadUtils.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2016 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.settings.search2;
+
+import android.os.BadParcelableException;
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.util.Log;
+
+import java.io.StreamCorruptedException;
+
+/**
+ * Utility class to Marshall and Unmarshall the payloads stored in the SQLite Database
+ */
+public class ResultPayloadUtils {
+
+    private static final String TAG = "PayloadUtil";
+
+    public static byte[] marshall(ResultPayload payload) {
+        Parcel parcel = Parcel.obtain();
+        payload.writeToParcel(parcel, 0);
+        byte[] bytes = parcel.marshall();
+        parcel.recycle();
+        return bytes;
+    }
+
+    public static <T> T unmarshall(byte[] bytes, Parcelable.Creator<T> creator) {
+        T result;
+        Parcel parcel = unmarshall(bytes);
+        result = creator.createFromParcel(parcel);
+        parcel.recycle();
+        return result;
+    }
+
+    private static Parcel unmarshall(byte[] bytes) {
+        Parcel parcel = Parcel.obtain();
+        parcel.unmarshall(bytes, 0, bytes.length);
+        parcel.setDataPosition(0);
+        return parcel;
+    }
+}