Detect whether a window is out of screen when using cropping window capturer

We are still using cropping window capturer even the window is out of the screen.
See the bug for details.

Bug: webrtc:8134
Change-Id: I5161b1a17a3a1f8244697eea5eb78975be6908f9
Reviewed-on: https://chromium-review.googlesource.com/627338
Commit-Queue: Zijie He <zijiehe@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#19474}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: dab31ce1fa39c2fe3ce0f9f7b3a2054bc9344a5d
3 files changed