Yannis Guyon 78ad57a36a Fix bad glClearColor parameters
Container spec indicates that background color is written
in BGRA byte order, but glClearColor() parameters are RGBA.
Anyway the checkerboard is displayed right after glClear()
calls so it replaces background color.

In response to webp-discuss/TkLHALGaHaM

Change-Id: Ief5435fadfd6a422b881a9dc240b5e8dc6546e19
2018-07-18 10:50:33 +02:00
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