Display quic-connection-options passed in the command line in QUIC tab
of net-internals page. connection-options also includes enable-pacing
argument which is displayed as PACE.

Fixes the rch's comments in https://codereview.chromium.org/471613002/

R=rch@chromium.org, thestig@chromium.org

Review URL: https://codereview.chromium.org/470493004

git-svn-id: http://src.chromium.org/svn/trunk/src/net@290095 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
Adding extension/mime mapping for HLS streams

This change adds a mapping between m3u8 extension and its mime type.
For android, we need to handle HLS streams separately later on

BUG=400145

Review URL: https://codereview.chromium.org/471193002

git-svn-id: http://src.chromium.org/svn/trunk/src/net@290097 4ff67af0-8c30-449e-8e8b-ad334ec8d88c