SkRasterPipeline in SkArenaAlloc

Bug: skia:6673

Change-Id: Ia2bae4f6a9039a007a10b6b45bcf2f0854bf6e5c
Reviewed-on: https://skia-review.googlesource.com/17794
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
diff --git a/src/effects/gradients/SkGradientShader.cpp b/src/effects/gradients/SkGradientShader.cpp
index c4a1dad..5a4a31c 100644
--- a/src/effects/gradients/SkGradientShader.cpp
+++ b/src/effects/gradients/SkGradientShader.cpp
@@ -417,7 +417,7 @@
         return false;
     }
 
-    SkRasterPipeline subclass;
+    SkRasterPipeline_<256> subclass;
     if (!this->adjustMatrixAndAppendStages(alloc, &matrix, &subclass)) {
         return false;
     }