Add nested SkPictureImageFilters to the GPU veto.

src/core/SkPictureCommon.h

Index: src/core/SkPictureCommon.h
diff --git a/src/core/SkPictureCommon.h b/src/core/SkPictureCommon.h
index 1c38b049fa7314771a5c06f6762e696cd666f831..b81f5a604e3b6df9a37b7f0e98c21fa86ad30d82 100644
--- a/src/core/SkPictureCommon.h
+++ b/src/core/SkPictureCommon.h
@@ -91,6 +91,9 @@ struct SkPathCounter {
             // Initially assume it's slow.
             fNumSlowPathsAndDashEffects++;
         }
+        if (paint && paint->getImageFilter()) {
+            fNumSlowPathsAndDashEffects += paint->getImageFilter()->numSlowPaths();
+        }
     }
 
     void operator()(const SkRecords::DrawPoints& op) {