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This is a reland of d8d1f551

Original change's description:
> Reland "Convert WidgetMsg_WaitForNextFrameForTest to mojo"
> 
> This is a reland of 75391394.
> 
> Reason for reland:
> - Fixed a flaky test failures in crrev.com/c/2309317
> - No changes in this CL between original & reland.
> 
> Original change's description:
> > Convert WidgetMsg_WaitForNextFrameForTest to mojo
> >
> > This CL uses VisualStateRequest Mojo API in FrameWidget mojo interface
> > introduced at https://crrev.com/c/2178480 since
> > WidgetMsg_WaitForNextFrameForTest has the same implementation with
> > VisualStateRequest Mojo API notifying that the frame swap has occurred.
> >
> > Bug: 1071588
> > Change-Id: If317b98320ec3fb85fcf7a5d1e39f0fa202d4cde
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2216145
> > Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
> > Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
> > Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#789910}
> 
> Bug: 1071588
> Change-Id: I7ade2819495cddf87862054095db361e0511dcf5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2309497
> Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
> Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
> Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#793839}

Bug: 1071588
Change-Id: I9499c2b89eb892b9275f9fa7f0445858ea5b5bec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2342333
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798575}