Flip IsWindowOnScreen behavior when native APIs fail

Per discussion in
https://chromium-review.googlesource.com/c/external/webrtc/+/641814, the
behavior of IsWindowOnScreen() functions when native APIs fail should be
flipped. I.e. window is *not* on screen if OS cannot find it.

Bug: chromium:758554
Change-Id: Ife449a5261fcd89c37595e29a0b1802fcf3c42a5
Reviewed-on: https://chromium-review.googlesource.com/644290
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Zijie He <zijiehe@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#19617}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 3aa4afd6307b915dfba0c7be6fd3bac0864541f8
2 files changed