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Fixes an issue where the visibility change was not percolated to the
DialogOverlay, which prevented resuming DRM playback on certain cast systems
as described in the internal bug.

Bug=b:78571682
Test=made sure the repro steps actually work w. the CL

Change-Id: I7b2f06a5b4c4eb1fd4ffd32a587444e49d1ffcf8
Reviewed-on: https://chromium-review.googlesource.com/1204718
Commit-Queue: Andrei Pascovici <apascovici@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589164}