Add GetWakeLockWithoutContext() in WakeLockContextProvider mojo interface.

device/wake_lock/public/interfaces/wake_lock_provider.mojom

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+module device.mojom;
+
+import "device/wake_lock/public/interfaces/wake_lock_context.mojom";
+import "device/wake_lock/public/interfaces/wake_lock_service.mojom";
+
+interface WakeLockProvider {
+
+  // Gets a WakeLockContext that is associated with |context_id|. |context_id|
+  // is used to obtain the NativeView associated with the relevant context on
+  // Android (see WakeLockContextCallback). |context_id| must be >= 0.
+  GetWakeLockContextForID(int32 context_id, WakeLockContext& context);
+
+  // Gets a WakeLock outside of any context. This method can be used
+  // if the client does not have any context available (e.g., is not
+  // within the context of a WebContents). However, note that the resulting
+  // Wake Lock will not have any effect on Android.
+  GetWakeLockWithoutContext(WakeLockType type,
+                            WakeLockReason reason,
+                            string description,
+                            WakeLockService& wake_lock);
+};