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We are adding a tentative API to experiment with dynamic delegation of
"autoplay" capability, and it will work with run-time flag
--enable-blink-features=ExperimentalAutoplayDynamicDelegation.

We have a test page with this API, which will auto-play the video after
click with the flag.
http://mustaqahmed.github.io/web/autoplay-dynamic-delegation-tester.html

Bug: 985914
Change-Id: I7756032bd8e18f55bc77fdb1929238ee724d8958
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1779012Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Mustaq Ahmed <mustaq@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692296}