Use burst mode for linear gradients w/ > 2 stops

Change-Id: I4c2778ca9a004ae8b45362e11cb15ac7703c18ac
Reviewed-on: https://skia-review.googlesource.com/19022
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
1 file changed