Add a dummy SkColorTable.cpp in src/codec

I'm planning to move the real SkColorTable.cpp to src/codec, but that
will require updating Chromium's BUILD.gn file to build it. Put this one
here so that Chromium has something to build until the real move takes
place.

Change-Id: I1f217cfc1f7841db34781510ef851497c58c086d
Reviewed-on: https://skia-review.googlesource.com/130940
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>
1 file changed