Store more behavior of SkFlatDictionary in SkFlatController.

Code refactoring for simplicity.

Review URL: https://codereview.appspot.com/6427046

git-svn-id: http://skia.googlecode.com/svn/trunk@4929 2bbb7eff-a529-9590-31e7-b0007b416f81
8 files changed