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This is a reland of a4cdec69
I checked it does not change the FullscreenControllerTests tests.

Original change's description:
> Fix orientation change test full-screen-orientation-change.html
>
> There are two ways to trigger fullscreen, either by user activation or by
> a user generated orientation change. When we enter the fullscreen mode,
> we should not consume the user activation in the browser side when the
> fullscreen is triggered by a user generated orientation change, so we
> need to set the orientation change flag in the browser side when we are
> calling the mock function setMockScreenOrientation through a mojo
> message.
>
> The CL that consumes the user activation on both the browser and
> renderer sides when entering fullscreen:
> https://chromium-review.googlesource.com/c/chromium/src/+/1903675
>
>
> Bug: 1046933
> Change-Id: I1eb86205bc82ac237bc12d63bbdb0c8985c06090
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2026170
> Reviewed-by: Ken Buchanan <kenrb@chromium.org>
> Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
> Commit-Queue: Lan Wei <lanwei@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#740812}

TBR=kenrb@chromium.org,alexmos@chromium.org,lanwei@chromium.org

Bug: 1046933
Change-Id: Ieaa57d457edbfe8b432b02df65eed409f40e63dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2054844
Commit-Queue: Lan Wei <lanwei@chromium.org>
Reviewed-by: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741126}