src/vs/workbench/services/extensionManagement/common/extensionManagementService.ts/ExtensionManagementService/install
class ExtensionManagementService:	async install(vsix: URI, options?: InstallVSIXOptions): Promise<ILocalExtension> {
		const manifest = await this.getManifest(vsix);
		return this.installVSIX(vsix, manifest, options);
	}