Add clamp before drawing F16->8888 in DMSrcSink ColorCodecSrc

Verified that this fixes the wrongness of a few of the colorImage
diffs in Gold.

Bug: skia:6738
Change-Id: Icf0b7573ccb87268b480d7cc0a6cfe6fa8ae73f7
Reviewed-on: https://skia-review.googlesource.com/19271
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Matt Sarett <msarett@google.com>
1 file changed