[Media] Added feature flag for new remote playback pipeline
Added a feature and a chrome://flags entry to hide the new remote playback
pipeline behind it. Created a virtual test folder for the relevant
LayoutTests with the flag enabled.
Moved some of these tests to media/controls/ to avoid running all the media
tests twice.
BUG=517102
TEST=run the new virtual tests with the flag enabled
Review-Url: https://codereview.chromium.org/2846713002
Cr-Original-Commit-Position: refs/heads/master@{#468224}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 232757946494489747c5752e32890f3819f2a658
62 files changed