Move download command to extension host

src/vs/workbench/api/browser/mainThreadDownloadService.ts

@@ -0,0 +1,26 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { Disposable } from 'vs/base/common/lifecycle';
+import { MainContext, IExtHostContext, MainThreadDownloadServiceShape } from 'vs/workbench/api/common/extHost.protocol';
+import { extHostNamedCustomer } from 'vs/workbench/api/common/extHostCustomers';
+import { IDownloadService } from 'vs/platform/download/common/download';
+import { UriComponents, URI } from 'vs/base/common/uri';
+
+@extHostNamedCustomer(MainContext.MainThreadDownloadService)
+export class MainThreadDownloadService extends Disposable implements MainThreadDownloadServiceShape {
+
+	constructor(
+		extHostContext: IExtHostContext,
+		@IDownloadService private readonly downloadService: IDownloadService
+	) {
+		super();
+	}
+
+	$download(uri: UriComponents, to: UriComponents): Promise<void> {
+		return this.downloadService.download(URI.revive(uri), URI.revive(to));
+	}
+
+}