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This is adding a flag to be able to control whether Web Audio should be
restricted by autoplay. It will allow testing and experimenting.

Bug: 841933
Change-Id: Icdec2e74b210f0cf49db87f79ac9a1cb60d94d63
Reviewed-on: https://chromium-review.googlesource.com/1067148Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560350}