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The Files app, as well as other apps, if they're evicted due to
being occluded by other windows, will show as empty for a second or
more in overview until reloaded.

This CL makes them behave the same way as browser windows, that is
they show stale contents until reloaded.

BUG=986085
TEST=Manually: follow steps on bug, and note the issue no longer shows.
TEST=Added new: browser_tests --gtest_filter=AppWindowBrowserTest.ShouldShowStaleContentOnEviction

Change-Id: Ie5ad2f07be3eae8627f16d9ddd3977d22f9085a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894095Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712172}