src/vs/workbench/api/common/extHostOutput.ts/ExtHostOutputChannel/log
class ExtHostOutputChannel:	protected log(level: LogLevel, message: string): void {
		this.offset += VSBuffer.fromString(message).byteLength;
		log(this.logger, level, message);
		if (this.visible) {
			this.logger.flush();
			this.proxy.$update(this.id, OutputChannelUpdateMode.Append);
		}
	}