Create feature factory interface & initial impl.

Creates the abstract class FeatureFactory and an AOSP implementation
called Factory.

Also creates a static library for generating logtags since we need to use the code generated
by the logtags in multiple packages now.

BUG: 27751878
Change-Id: I88d826333642d3efc252134c4facb7b1ca014f32
(cherry picked from commit 867bb9c07a)

src/com/android/settings/overlay/FeatureFactoryImpl.java

@@ -0,0 +1,35 @@
+/*
+ * 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.overlay;
+
+import android.content.Context;
+import android.widget.Toast;
+
+/**
+ * {@link FeatureFactory} implementation for AOSP Settings.
+ */
+public class FeatureFactoryImpl extends FeatureFactory {
+    @Override
+    public ToastController createToastController() {
+        return new ToastController() {
+            @Override
+            public void makeToast(Context context) {
+                Toast.makeText(context, "Here's a piece of AOSP toast", Toast.LENGTH_LONG).show();
+            }
+        };
+    }
+}