add View Extensions menu action

fixes #8098

src/vs/code/electron-main/menus.ts

@@ -523,6 +523,7 @@ export class VSCodeMenu {
 		let search = this.createMenuItem(nls.localize({ key: 'miViewSearch', comment: ['&& denotes a mnemonic'] }, "&&Search"), 'workbench.view.search');
 		let git = this.createMenuItem(nls.localize({ key: 'miViewGit', comment: ['&& denotes a mnemonic'] }, "&&Git"), 'workbench.view.git');
 		let debug = this.createMenuItem(nls.localize({ key: 'miViewDebug', comment: ['&& denotes a mnemonic'] }, "&&Debug"), 'workbench.view.debug');
+		let extensions = this.createMenuItem(nls.localize({ key: 'miViewExtensions', comment: ['&& denotes a mnemonic'] }, "E&&xtensions"), 'workbench.view.extensions');
 		let output = this.createMenuItem(nls.localize({ key: 'miToggleOutput', comment: ['&& denotes a mnemonic'] }, "&&Output"), 'workbench.action.output.toggleOutput');
 		let debugConsole = this.createMenuItem(nls.localize({ key: 'miToggleDebugConsole', comment: ['&& denotes a mnemonic'] }, "De&&bug Console"), 'workbench.debug.action.toggleRepl');
 		let integratedTerminal = this.createMenuItem(nls.localize({ key: 'miToggleIntegratedTerminal', comment: ['&& denotes a mnemonic'] }, "&&Integrated Terminal"), 'workbench.action.terminal.toggleTerminal');
@@ -550,6 +551,7 @@ export class VSCodeMenu {
 			search,
 			git,
 			debug,
+			extensions,
 			__separator__(),
 			output,
 			problems,

src/vs/workbench/parts/extensions/electron-browser/extensions.ts

@@ -10,7 +10,7 @@ import { TPromise } from 'vs/base/common/winjs.base';
 import { IPager } from 'vs/base/common/paging';
 import { IQueryOptions } from 'vs/platform/extensionManagement/common/extensionManagement';
 
-export const VIEWLET_ID = 'workbench.viewlet.extensions';
+export const VIEWLET_ID = 'workbench.view.extensions';
 
 export interface IExtensionsViewlet extends IViewlet {
 	search(text: string, immediate?: boolean): void;

src/vs/workbench/parts/extensions/electron-browser/extensionsActions.ts

@@ -211,7 +211,7 @@ export class EnableAction extends Action {
 
 export class OpenExtensionsViewletAction extends ToggleViewletAction {
 
-	static ID = 'workbench.extensions.showViewlet';
+	static ID = VIEWLET_ID;
 	static LABEL = localize('toggleExtensionsViewlet', "Show Extensions");
 
 	constructor(

src/vs/workbench/parts/extensions/electron-browser/extensionsViewlet.ts

@@ -24,8 +24,7 @@ import { ITelemetryService } from 'vs/platform/telemetry/common/telemetry';
 import { PagedList } from 'vs/base/browser/ui/list/listPaging';
 import { IInstantiationService } from 'vs/platform/instantiation/common/instantiation';
 import { Delegate, Renderer } from './extensionsList';
-import { IExtensionsWorkbenchService, IExtension } from './extensions';
-import { IExtensionsViewlet } from './extensions';
+import { IExtensionsWorkbenchService, IExtension, IExtensionsViewlet, VIEWLET_ID } from './extensions';
 import { ShowExtensionRecommendationsAction, ShowPopularExtensionsAction } from './extensionsActions';
 import { IExtensionManagementService, IExtensionGalleryService, SortBy } from 'vs/platform/extensionManagement/common/extensionManagement';
 import { ExtensionsInput } from './extensionsInput';
@@ -34,8 +33,6 @@ import { IWorkbenchEditorService } from 'vs/workbench/services/editor/common/edi
 
 export class ExtensionsViewlet extends Viewlet implements IExtensionsViewlet {
 
-	static ID: string = 'workbench.viewlet.extensions';
-
 	private searchDelayer: ThrottledDelayer<any>;
 	private root: HTMLElement;
 	private searchBox: HTMLInputElement;
@@ -52,7 +49,7 @@ export class ExtensionsViewlet extends Viewlet implements IExtensionsViewlet {
 		@IWorkbenchEditorService private editorService: IWorkbenchEditorService,
 		@IExtensionsWorkbenchService private extensionsWorkbenchService: IExtensionsWorkbenchService
 	) {
-		super(ExtensionsViewlet.ID, telemetryService);
+		super(VIEWLET_ID, telemetryService);
 		this.searchDelayer = new ThrottledDelayer(500);
 	}