Google WebRTC 编译笔记安装软件：其中Windows环境下还需要注意打补丁安装depot_tools附录
安装软件：Depot Tools1. You'll need to have the depot tools installed:https://sites.google.com/a/chromium.org/dev/developers/how-tos/depottools 2. You need git installed (needed for getting WebMsou
