src/vs/workbench/api/common/extHostExtensionService.ts/AbstractExtHostExtensionService/$startExtensionHost
class AbstractExtHostExtensionService:	public $startExtensionHost(extensionsDelta: IExtensionDescriptionDelta): Promise<void> {
		extensionsDelta.toAdd.forEach((extension) => (<any>extension).extensionLocation = URI.revive(extension.extensionLocation));

		const { globalRegistry, myExtensions } = AbstractExtHostExtensionService._applyExtensionsDelta(this._globalRegistry, this._myRegistry, extensionsDelta);
		this._globalRegistry.set(globalRegistry.getAllExtensionDescriptions());
		this._myRegistry.set(myExtensions);

		return this._startExtensionHost();
	}