Build infra to inject slice to PreferenceFragment

Reuse the PreferenceController and LayoutPreference however create
specific one for slice:
1. SlicePreference: container to inject slice view
2. SlicePreferenceController: handle updates for slice

Also add styles for it with default layout.

Bug: 120803703
Test: RunSettingsRoboTests

Change-Id: I6ab083ad57117e6198dcba37702a25213da78719

src/com/android/settings/slices/SlicePreference.java

@@ -0,0 +1,48 @@
+/*
+ * 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.slices;
+
+import android.content.Context;
+import android.util.AttributeSet;
+
+import androidx.slice.Slice;
+import androidx.slice.widget.SliceView;
+
+import com.android.settings.R;
+import com.android.settingslib.widget.LayoutPreference;
+
+/**
+ * Preference for {@link SliceView}
+ */
+public class SlicePreference extends LayoutPreference {
+    private SliceView mSliceView;
+
+    public SlicePreference(Context context, AttributeSet attrs) {
+        super(context, attrs, R.attr.slicePreferenceStyle);
+        mSliceView = findViewById(R.id.slice_view);
+    }
+
+    public SlicePreference(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, R.attr.slicePreferenceStyle);
+        mSliceView = findViewById(R.id.slice_view);
+    }
+
+    public void onSliceUpdated(Slice slice) {
+        mSliceView.onChanged(slice);
+        notifyChanged();
+    }
+}