Urvang Joshi 0cc811d7d6 gif2webp: Background color correction
For some GIF images, the first frame is missing the corresponding
graphic control extension. For such cases, we were never calling
GetBackgroundColor(), and default background color value (white) was being used
incorrectly.
So, we call GetBackgroundColor() when we encounter the first image
descriptor instead, to make sure that it is always called.

Change-Id: I00fc8e943d8a0c1578dcd718f3e74dec7de4ed61
2014-09-18 15:07:28 -07:00
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