Centralize decision about whether to do bicubic filtering, and fallbacks to mip, bilerp, or nearest

R=robertphillips@google.com, humper@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/282293004

git-svn-id: http://skia.googlecode.com/svn/trunk@14809 2bbb7eff-a529-9590-31e7-b0007b416f81
5 files changed