Add flag to install an extension from the command line (#504)

packages/vscode/src/fill/environmentService.ts

@@ -1,7 +1,9 @@
-import * as path from "path";
 import * as paths from "./paths";
 import * as environment from "vs/platform/environment/node/environmentService";
 
+/**
+ * Customize paths using data received from the initialization message.
+ */
 export class EnvironmentService extends environment.EnvironmentService {
 	public get sharedIPCHandle(): string {
 		return paths.getSocketPath() || super.sharedIPCHandle;