Add SkData::NewFromFD.

Chromium needs a SkStream backed by a file descriptor.
Skia already has the code and can do the work, this change exposes the
functionality in Skia in a clean way.

https://codereview.chromium.org/15941025/


git-svn-id: http://skia.googlecode.com/svn/trunk@9408 2bbb7eff-a529-9590-31e7-b0007b416f81
12 files changed