Craig Mautner 24d88747e9 Reduce situations where black thumbnail occurs.
Pause and retry capturing a thumbnail if the window hasn't yet
been drawn. Still will show black thumbnails if recents is pressed
before window has anything drawn.

Improves bug 7552304.

Change-Id: I550c5a60510bfc4547bbb44451d57b4bc9f49880
2013-03-22 12:07:51 -07:00
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