This patch adds support for optional processing of the alpha channel in
the matrix convolution filter.  Test cases are added to the GM and the
bench.

NOTE:  This will require rebaselining the matrixconvolution GM, so it will 
likely turn the bots red until that is done.

https://codereview.appspot.com/6547049/



git-svn-id: http://skia.googlecode.com/svn/trunk@5661 2bbb7eff-a529-9590-31e7-b0007b416f81
4 files changed