Revert "transform paint color to dst colorspace"

This reverts commit 6eb36214461794626291a01c3150f7239e4a91a3.

Reason for revert: UBSAN/ASAN failures

Original change's description:
> transform paint color to dst colorspace
> 
> Hopefully I can start to knock off effects that need
> to be converted to dst colorspace one at a time now.
> 
> My rough list is,
>    - paint color               <----
>    - image shader
>    - sprite blitter
>    - gradients?
>    - mode color filter
>    - lighting color filter
>    - high contrast filter
>    - toSRGB color filter
> 
> This change cuts the diffs between 8888 and srgb from
> ~540 to ~500.
> 
> I left myself a note about not being able to interpret null
> to sRGB at a high level yet.  That'd cause a ton of 8888 diffs,
> and I think SkColorSpaceXformCanvas diffs too.
> 
> Change-Id: Id66a63e0e92130927f267719aeccb8bbcd92973a
> Reviewed-on: https://skia-review.googlesource.com/140244
> Reviewed-by: Brian Osman <brianosman@google.com>
> Commit-Queue: Mike Klein <mtklein@google.com>

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

Change-Id: I31a17b6e70916c463d38488703cfade347c05f2b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/140382
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2 files changed