Begin implementation of SkImage_Base::makeColorSpace

Originally:
https://skia-review.googlesource.com/9622

CQ_INCLUDE_TRYBOTS=skia.primary:Test-Mac-Clang-MacMini6.2-CPU-AVX-x86_64-Release,Test-Android-Clang-PixelC-CPU-TegraX1-arm64-Debug-Android

BUG=skia:

Change-Id: I7ef1daaab32892399e3333e4b2fc75d70a1900e4
Reviewed-on: https://skia-review.googlesource.com/9651
Commit-Queue: Matt Sarett <msarett@google.com>
Reviewed-by: Matt Sarett <msarett@google.com>
6 files changed