Merge from master

src/vs/platform/download/common/download.ts

@@ -0,0 +1,18 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { URI } from 'vs/base/common/uri';
+import { createDecorator } from 'vs/platform/instantiation/common/instantiation';
+import { CancellationToken } from 'vs/base/common/cancellation';
+
+export const IDownloadService = createDecorator<IDownloadService>('downloadService');
+
+export interface IDownloadService {
+
+	_serviceBrand: any;
+
+	download(uri: URI, to: string, cancellationToken?: CancellationToken): Promise<void>;
+
+}