Revert "Revert "SkColorSpaceXformer: Preserve local matrix on shaders""

Revert "Revert "SkColorSpaceXformer: Preserve local matrix on shaders""

This reverts commit a50a11c17ed9037d3e60d8319727583dba803cec.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Revert "SkColorSpaceXformer: Preserve local matrix on shaders"
>
> This reverts commit 5d884b562828ceb13ccacb71bc4581d2020e62bb.
>
> Reason for revert: Wrong thing to revert
>
> Original change's description:
> > SkColorSpaceXformer: Preserve local matrix on shaders
> >
> > Also, do not drop unknown shaders.
> >
> > Fixes cts tests.
> >
> > b/37161109
> > b/37237678
> >
> > Bug: skia:
> > Change-Id: I0fd817a4d6461ede0ccdcb8f3cccb255b646b864
> > Reviewed-on: https://skia-review.googlesource.com/13246
> > Commit-Queue: Matt Sarett <msarett@google.com>
> > Commit-Queue: Mike Klein <mtklein@chromium.org>
> > Reviewed-by: Mike Klein <mtklein@chromium.org>
> >
>
> TBR=mtklein@chromium.org,mtklein@google.com,msarett@google.com,reviews@skia.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
>
> Change-Id: I34e02785ac43a04f8452c458680ea1d6518818a6
> Reviewed-on: https://skia-review.googlesource.com/13258
> Reviewed-by: Matt Sarett <msarett@google.com>
> Commit-Queue: Matt Sarett <msarett@google.com>
>

TBR=mtklein@chromium.org,mtklein@google.com,msarett@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I2dfac7d41caf0e32d3bb5f3f330fff4970c0545e
Reviewed-on: https://skia-review.googlesource.com/13260
Reviewed-by: Matt Sarett <msarett@google.com>
Commit-Queue: Matt Sarett <msarett@google.com>