GIF: Only report a frame after knowing dependency

GIF: Only report a frame after knowing dependency

Previously, getFrameInfo might report a frame that was truncated prior
to setting its requiredFrame. As a result, fRequiredFrame may be
different depending on how much data has already been received.

If there is a local color table, do not report the frame until the
color table has been received, since that is used to determine
fRequiredFrame. If there is no local color table, set fRequiredFrame
and report the frame after reading the header.

Add a test.

Replace make_from_resource with GetResourceAsData

Change-Id: I1b697f766c1d0e1e12ab2ae1d27167af5193395d
Reviewed-on: https://skia-review.googlesource.com/7756
Reviewed-by: Matt Sarett <msarett@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>