Add VR feature flags and HAL.

Bug: 36097960
Bug: 36462741
Test: adb shell lshal on device, successfully ran Daydream Home, though I'm
seeing some crashes in various things.
Change-Id: Id1af18701e2021ab8c3de7889ec71c316fe4420c

vr/VrDevice.cpp

@@ -0,0 +1,43 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "VrDevice"
+
+#include "VrDevice.h"
+
+namespace android {
+namespace hardware {
+namespace vr {
+namespace V1_0 {
+namespace implementation {
+
+VrDevice::VrDevice() {}
+
+Return<void> VrDevice::init() {
+    // NOOP
+    return Void();
+}
+
+Return<void> VrDevice::setVrMode(bool /* enabled */) {
+    // TODO(b/36514493): start or stop using thermal engine VR profile.
+    return Void();
+}
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace vr
+}  // namespace hardware
+}  // namespace android