braveyao adb161fecc windowCapture: return 1x1 frame to minimized winodw on Linux.
During window capturing, if the target window is minimized, OSX/Windows
will return a 1x1 frame and then webrtc knows to replace it with a black
frame. Let's do same on Linux too.

BUG=568840

Review-Url: https://codereview.webrtc.org/2989233002
Cr-Commit-Position: refs/heads/master@{#19224}
2017-08-02 22:37:29 +00:00
..
2017-07-06 19:11:40 +00:00
2017-07-25 21:37:07 +00:00
2016-10-19 01:22:25 +00:00
2016-10-19 01:22:25 +00:00