Reorganize blur filter to insert new implementation

Change-Id: Ie9afd2de2bfb9bcd04b5f8b7f319a24025520bef
Reviewed-on: https://skia-review.googlesource.com/52400
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Stephen White <senorblanco@chromium.org>
1 file changed