commit ad9e23861ec997cf9de48fb7d61b6df677ef059f
author Zijie He <zijiehe@chromium.org> Tue Aug 15 22:45:00 2017
committer Commit Bot <commit-bot@chromium.org> Wed Aug 16 17:45:18 2017
tree 29636b80c8ecac100197361258ae5ea6a3df986a
parent ec997136990190521fc5f9c2eb510d2e9faea97d

Replace WindowUnderPoint free function with WindowFinder interface

WindowUnderPoint have different signatures on different platforms, which should
be abstract as an interface.
So this change adds a WindowFinder interface to replace WindowUnderPoint free
function. Meanwhile, this change also includes the implementation of
WindowFinderX11 for X11.

Bug: webrtc:7950
Change-Id: I897a50d4033e713b339b6b6f48b5dbbe601e8db0
Reviewed-on: https://chromium-review.googlesource.com/611745
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Zijie He <zijiehe@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#19375}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 70fbbad5ac65d6c20b1deb82c98c9fc0f880988c