Consolidate all wrappers used for testing.

- Add the wrapper package and move all wrappers to the wrapper package.
- Get rid of some wrapper interface/impl implementation and have a
wrapper class directly.

Bug: 65634579
Test: make RunSettingsRoboTests
Change-Id: Ic757d8f7bacfa7a034c7e692205bc1dc4b0e1de1

src/com/android/settings/wrapper/PowerManagerWrapper.java

@@ -0,0 +1,49 @@
+/*
+ * 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.wrapper;
+
+import android.os.PowerManager;
+
+/**
+ * This class replicates a subset of the android.os.PowerManager. The class exists so that we can
+ * use a thin wrapper around the PowerManager in production code and a mock in tests. We cannot
+ * directly mock or shadow the PowerManager, because some of the methods we rely on are newer than
+ * the API version supported by Robolectric or are hidden.
+ */
+public class PowerManagerWrapper {
+    private final PowerManager mPowerManager;
+
+    public PowerManagerWrapper(PowerManager powerManager) {
+        mPowerManager = powerManager;
+    }
+
+    public int getMinimumScreenBrightnessSetting() {
+        return mPowerManager.getMinimumScreenBrightnessSetting();
+    }
+
+    public int getMaximumScreenBrightnessSetting() {
+        return mPowerManager.getMaximumScreenBrightnessSetting();
+    }
+
+    public int getMinimumScreenBrightnessForVrSetting() {
+        return mPowerManager.getMinimumScreenBrightnessForVrSetting();
+    }
+
+    public int getMaximumScreenBrightnessForVrSetting() {
+        return mPowerManager.getMaximumScreenBrightnessForVrSetting();
+    }
+}