Add SDK 29 sources.

Test: N/A
Change-Id: Iedb7a31029e003928eb16f7e69ed147e72bb6235
diff --git a/android/os/DeviceIdleManager.java b/android/os/DeviceIdleManager.java
new file mode 100644
index 0000000..9039f92
--- /dev/null
+++ b/android/os/DeviceIdleManager.java
@@ -0,0 +1,69 @@
+/*
+ * 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 android.os;
+
+import android.annotation.NonNull;
+import android.annotation.SystemService;
+import android.annotation.TestApi;
+import android.content.Context;
+
+/**
+ * Access to the service that keeps track of device idleness and drives low power mode based on
+ * that.
+ *
+ * @hide
+ */
+@TestApi
+@SystemService(Context.DEVICE_IDLE_CONTROLLER)
+public class DeviceIdleManager {
+    private final Context mContext;
+    private final IDeviceIdleController mService;
+
+    /**
+     * @hide
+     */
+    public DeviceIdleManager(@NonNull Context context, @NonNull IDeviceIdleController service) {
+        mContext = context;
+        mService = service;
+    }
+
+    /**
+     * @return package names the system has white-listed to opt out of power save restrictions,
+     * except for device idle mode.
+     */
+    public @NonNull String[] getSystemPowerWhitelistExceptIdle() {
+        try {
+            return mService.getSystemPowerWhitelistExceptIdle();
+        } catch (RemoteException e) {
+            e.rethrowFromSystemServer();
+            return new String[0];
+        }
+    }
+
+    /**
+     * @return package names the system has white-listed to opt out of power save restrictions for
+     * all modes.
+     */
+    public @NonNull String[] getSystemPowerWhitelist() {
+        try {
+            return mService.getSystemPowerWhitelist();
+        } catch (RemoteException e) {
+            e.rethrowFromSystemServer();
+            return new String[0];
+        }
+    }
+}