Move SkDecodingImageGenerator.h to include/

This will allow Android to access it and remove SkImageRef.

Depends on https://codereview.chromium.org/293283002/

BUG=skia:2389
R=reed@google.com, djsollen@google.com, halcanary@google.com

Author: scroggo@google.com

Review URL: https://codereview.chromium.org/228613003

git-svn-id: http://skia.googlecode.com/svn/trunk@14891 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed