Block loading media when distilling page.

When distilling a page with media content, the media starts to play even
if the webState is in the background.
This cause audio playing in case of an audio, and the video player to
start in case of a video.

This CL blocks loading the media pages when distilling.

Bug: 919326
Change-Id: I3717618ba31019fbc173cb721436a323acfbc6aa
Reviewed-on: https://chromium-review.googlesource.com/c/1409514
Commit-Queue: Eric Noyau <noyau@chromium.org>
Auto-Submit: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Eric Noyau <noyau@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625196}
2 files changed