always store bitfields along with dirty in FlatteningTraits

This allows us to simplify lots of setters in SkPaint, which in the non-android case, could now be just assignments (and therefore inlineable).

R=mtklein@google.com, robertphillips@google.com, tomhudson@google.com

Author: reed@google.com

Review URL: https://codereview.chromium.org/240273004

git-svn-id: http://skia.googlecode.com/svn/trunk@14229 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed