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We're doing some clean up and would like to retract SkColorSpaceXform
from Skia's public API.  It's obsolete now that you can either,

   1) just use Skia's drawing pipeline or readPixels()/writePixels()
      for most of its functionality; or
   2) use the much more flexible skcms interface for fancy features.

In the case of ui/gfx/color_transform, I decided to go with skcms
because it can naturally consume and produce the 3-float TriStim format
this code wants to use.  The old SkColorSpaceXform required two extra
transformations and an allocation, where skcms can do everything in
place natively.

Using draws or readPixels()/writePixels() would have required us to keep
those extra transforms, as they don't (yet?) support RGB_fff pixels.

Change-Id: I70f64c3ad72ebe227ed7a2a1dd7391863a8737e3
Reviewed-on: https://chromium-review.googlesource.com/1196375Reviewed-by: ccameron <ccameron@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587703}