Fix compilation errors

src/vs/workbench/test/browser/api/extHostDiagnostics.test.ts

@@ -389,6 +389,9 @@ suite('ExtHostDiagnostics', () => {
 			assertRegistered(): void {
 
 			}
+			drain() {
+				return undefined!;
+			}
 		}, new NullLogService());
 
 		let collection1 = diags.createDiagnosticCollection(nullExtensionDescription.identifier, 'foo');
@@ -438,6 +441,9 @@ suite('ExtHostDiagnostics', () => {
 			assertRegistered(): void {
 
 			}
+			drain() {
+				return undefined!;
+			}
 		}, new NullLogService());
 
 

src/vs/workbench/test/browser/api/extHostFileSystemEventService.test.ts

@@ -15,7 +15,8 @@ suite('ExtHostFileSystemEventService', () => {
 		const protocol: IMainContext = {
 			getProxy: () => { return undefined!; },
 			set: undefined!,
-			assertRegistered: undefined!
+			assertRegistered: undefined!,
+			drain: undefined!
 		};
 
 		const watcher1 = new ExtHostFileSystemEventService(protocol, new NullLogService(), undefined!).createFileSystemWatcher('**/somethingInteresting', false, false, false);

src/vs/workbench/test/browser/api/mainThreadDiagnostics.test.ts

@@ -32,6 +32,7 @@ suite('MainThreadDiagnostics', function () {
 						$acceptMarkersChange() { }
 					};
 				}
+				drain(): any { return null; }
 			},
 			markerService,
 			new class extends mock<IUriIdentityService>() {

src/vs/workbench/test/browser/api/mainThreadTreeViews.test.ts

@@ -66,6 +66,7 @@ suite('MainThreadHostTreeView', function () {
 				getProxy(): any {
 					return extHostTreeViewsShape;
 				}
+				drain(): any { return null; }
 			}, new TestViewsService(), new TestNotificationService(), testExtensionService, new NullLogService());
 		mainThreadTreeViews.$registerTreeViewDataProvider(testTreeViewId, { showCollapseAll: false, canSelectMany: false });
 		await testExtensionService.whenInstalledExtensionsRegistered();