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When native-win-occlusion is turned on, this will cause the page visiblity API to get triggered
when the screen is locked/unlocked.

Bug: 532128, 813093
Change-Id: Ic747188d31ebf9a692a6913d9b84a70f86c9d2aa
Reviewed-on: https://chromium-review.googlesource.com/c/1481581Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635202}