Add gfx::ColorSpace(const SkColorSpace&) constructor.

gfx::ColorSpace can convert to a SkColorSpace, but there was no simple
way to convert the other way around. This change addresses that need.

Bug: 758057,810131
Change-Id: Id6bb1b079f17cc632ab04cddd162dc94ee50a287
Reviewed-on: https://chromium-review.googlesource.com/1090234
Commit-Queue: Yuri Wiitala <miu@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565859}
3 files changed