Enable FP reporting for EME policy violations.

This queues a report through the Reporting API whenever
requestMediaKeySystemAccess is called in a frame in which the 'encrypted-media'
feature is not allowed according to feature policy.

Bug: 867471
Change-Id: I781cf9d9719bcbaffe0b328c2b6bfa5ca197920a
Reviewed-on: https://chromium-review.googlesource.com/c/1261921
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Commit-Queue: Ian Clelland <iclelland@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596965}
3 files changed