braveyao b2b803cb74 desktopCapture: minimized window shouldn't be treated as on-top on Win10
During window capture on Windows 10, if the selected window is minimized,
ShouldUseScreenCapturer() still thinks it's on top and continue to do a
screencapture which is meaningless.
This cl will set |.is_top_window| with false to minimized window,then we
can skip doing any capture to it.

BUG=chromium:568835

Review-Url: https://codereview.webrtc.org/2997493002
Cr-Commit-Position: refs/heads/master@{#19276}
2017-08-08 20:30:01 +00:00
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