Add support for writing ICC profiles to webp encoder

Bug: skia:
Change-Id: If0a8f84ed88da96924370b841f2283c0ff8e32ab
Reviewed-on: https://skia-review.googlesource.com/10212
Commit-Queue: Matt Sarett <msarett@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
3 files changed