Part 3.8: Is policy list subsumed under subsuming policy?

This CL (finally) considers list wildcards. For example:
A = *
B = ftp: http: https: ws: wss:

A subsumes B.

However,
if B is "ftp: http: https: ws: wss: 'unsafe-inline'", then A does not
subsume B because `unsafe-inline` is not allowed by A.

BUG=647688

Review-Url: https://codereview.chromium.org/2555153002
Cr-Commit-Position: refs/heads/master@{#437298}
4 files changed