This CL adds a method to create process using LowBox token on Windows. LowBox will help us tackle some of the escapes from Sandbox.

R=cpu,jschuh,rvargas,wfh,forshaw
BUG=455496

Review URL: https://codereview.chromium.org/937353002

Cr-Commit-Position: refs/heads/master@{#318648}
10 files changed