Reland "Revert "Add support for gray + colorspace to SkCodec""

This reverts commit 5bcab74e7a7540daabf405055adeffa6e4714891.

Reason for revert: ASAN/MSAN/UBSAN

Original change's description:
> Revert "Revert "Add support for gray + colorspace to SkCodec""
> 
> This reverts commit a51d1b45a3c12f5b3c5a4e04800b0abe57e999fe.
> 
> Bug: skia:
> Change-Id: I9536dc32e9616c700445a996264ef811f131b6e9
> Reviewed-on: https://skia-review.googlesource.com/150913
> Reviewed-by: Leon Scroggins <scroggo@google.com>
> Commit-Queue: Brian Osman <brianosman@google.com>

TBR=mtklein@google.com,scroggo@google.com,brianosman@google.com

Change-Id: Ief6353cc07fa30f89371967e50a2c9dd9ddc0ba5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/151443
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
5 files changed