Add a GM to exercise some complex gradient constructs

Change-Id: Ic6bd68be74619fad1babbe2b969f337208e1a3b3
Reviewed-on: https://skia-review.googlesource.com/15191
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
1 file changed