Port jenkins scripts: compile config and host.

Porting https://build.webmproject.org/jenkins/view/webm/libwebm_compile
shell command. This is intended to work locally, as well.

Change-Id: Ifa1a0f42de5f2c96d11978962bb0c34c9e684617
Bug: b:185520494, chromium:1028422
2 files changed