SkBitmap now really stores SkImageInfo -- config is just a ruse

(edited) clone of https://codereview.chromium.org/159173004/

Review URL: https://codereview.chromium.org/159463003

git-svn-id: http://skia.googlecode.com/svn/trunk@13391 2bbb7eff-a529-9590-31e7-b0007b416f81
7 files changed