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diff --git a/‎src/vs/workbench/browser/activity.ts‎
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+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { Registry } from 'vs/platform/platform';
+import { IConstructorSignature0 } from 'vs/platform/instantiation/common/instantiation';
+
+export interface IActivity {
+	id: string;
+	name: string;
+	cssClass: string;
+}
+
+export const Extensions = {
+	Activities: 'workbench.contributions.activities'
+};
+
+export interface IActivityRegistry {
+	registerActivity(descriptor: IConstructorSignature0<IActivity>): void;
+	getActivities(): IConstructorSignature0<IActivity>[];
+}
+
+export class ActivityRegistry implements IActivityRegistry {
+
+	private activityDescriptors = new Set<IConstructorSignature0<IActivity>>();
+
+	registerActivity(descriptor: IConstructorSignature0<IActivity>): void {
+		this.activityDescriptors.add(descriptor);
+	}
+
+	getActivities(): IConstructorSignature0<IActivity>[] {
+		const result: IConstructorSignature0<IActivity>[] = [];
+		this.activityDescriptors.forEach(d => result.push(d));
+		return result;
+	}
+}
+
+Registry.add(Extensions.Activities, new ActivityRegistry());