Base implementation of WFC disclaimer UI

Test: manual - Check that no error occurred when changing the wifi
calling settings to turn on.
Test: auto - Passed WifiCallingSettingsForSubTest,
WifiCallingDisclaimerFragmentTest and DisclaimerItemListAdapterTest.
Bug: 67872298

Change-Id: I789f530d3e16baa6e56feaa4269f6696976f747e

tests/robotests/src/com/android/settings/testutils/shadow/ShadowDisclaimerItemFactory.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2018 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.testutils.shadow;
+
+import android.content.Context;
+
+import com.android.settings.wifi.calling.DisclaimerItemFactory;
+import com.android.settings.wifi.calling.DisclaimerItem;
+
+import java.util.List;
+
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+
+@Implements(DisclaimerItemFactory.class)
+public final class ShadowDisclaimerItemFactory {
+    private static List<DisclaimerItem> sMockDisclaimerItemList;
+
+    public static void setDisclaimerItemList(List<DisclaimerItem> list) {
+        sMockDisclaimerItemList = list;
+    }
+
+    @Implementation
+    public static List<DisclaimerItem> create(Context context, int subId) {
+        return sMockDisclaimerItemList;
+    }
+}