This patch implements generalized DAG connectivity for SkImageFilter.  SkImageFilter maintains a list of inputs, which can be constructed either from a SkImageFilter** or zero or more SkImageFilter* arguments (varargs).

Existing filters which maintained their own filter connectivity were refactored to use the new constructors and flattening/unflattening code.  Modifying the remaining filters which are not yet DAG-friendly is left for future work; they are considered to have zero inputs for now.

Review URL: https://codereview.appspot.com/6443119

git-svn-id: http://skia.googlecode.com/svn/trunk@5891 2bbb7eff-a529-9590-31e7-b0007b416f81
11 files changed