GitLab

This CL plumbs the power experiment state to the media players in the
renderer that they are / are not the only playing player.  This
lets the renderer decide whether to start measuring power usage.

Bug: 1017783
Change-Id: I17e9b453c63482b20bf2b9c4d802ff346f7bd44e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992686Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729937}