Pascal Massimino af2e05cbdf vwebp: Clear previous frame when a key triggers a redraw
otherwise, transparent areas were accumulating.

Change-Id: I066a96a2bcf0cac750b3df0c02229542b1ed3473
(cherry picked from commit c0a27fd2af75dc0c6df7e0847a45fa152b45d0ab)
2016-12-07 18:30:23 -08:00
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