Add a few pages to search index.

- Data saver
- A few special permission access pages
   - Picture-in-picture
   - Premium sms
   - do not disturb access
- And a unrelated cleanup: move EmptyTextFragment from
  notification/ to widget/

Bug: 70720645
Test: robotests
Change-Id: I6a87f712bf81f9fd32fa9a3826fba851ca748409

src/com/android/settings/widget/EmptyTextSettings.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2015 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.widget;
+
+import android.annotation.Nullable;
+import android.os.Bundle;
+import android.util.TypedValue;
+import android.view.Gravity;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.ViewGroup.LayoutParams;
+import android.widget.TextView;
+
+import com.android.settings.SettingsPreferenceFragment;
+
+public abstract class EmptyTextSettings extends SettingsPreferenceFragment {
+
+    private TextView mEmpty;
+
+    @Override
+    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+        mEmpty = new TextView(getContext());
+        mEmpty.setGravity(Gravity.CENTER);
+        TypedValue value = new TypedValue();
+        getContext().getTheme().resolveAttribute(android.R.attr.textAppearanceMedium, value, true);
+        mEmpty.setTextAppearance(value.resourceId);
+        ((ViewGroup) view.findViewById(android.R.id.list_container)).addView(mEmpty,
+                new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
+        setEmptyView(mEmpty);
+    }
+
+    protected void setEmptyText(int text) {
+        mEmpty.setText(text);
+    }
+}