Create a feature provider for data plan feature. This change will

allow us to enable/disable this feature from adb shell.

Bug: 62349208
Test: make RunSettingsRoboTests -j40
Change-Id: I2d0bed738d5d4cd0fe1de056ee37092d46be72b6

src/com/android/settings/datausage/DataPlanFeatureProviderImpl.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2017 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.datausage;
+
+import android.os.SystemProperties;
+
+/**
+ * Impl for data plan feature provider.
+ */
+public final class DataPlanFeatureProviderImpl implements DataPlanFeatureProvider {
+  private static final String ENABLE_SETTINGS_DATA_PLAN = "enable.settings.data.plan";
+
+  @Override
+  public boolean isEnabled() {
+    return SystemProperties.getBoolean(ENABLE_SETTINGS_DATA_PLAN, false /* default */);
+  }
+}