GitLab

By default, the script will build CronetChromeWebView.framework and copy the
results to ./out/CronetChromeWebView/. use_goma=true is also passed to gn unless
specified otherwise with the --no-goma option.

BUG=none

Review-Url: https://codereview.chromium.org/2941683002
Cr-Commit-Position: refs/heads/master@{#481957}