src/vs/platform/extensionManagement/common/extensionManagementIpc.ts/ExtensionManagementChannelClient/installFromGallery
class ExtensionManagementChannelClient:	installFromGallery(extension: IGalleryExtension, installOptions?: ServerInstallOptions): Promise<ILocalExtension> {
		return Promise.resolve(this.channel.call<ILocalExtension>('installFromGallery', [extension, installOptions])).then(local => transformIncomingExtension(local, null));
	}