[svg] Implement feMorphology filter

https://www.w3.org/TR/SVG11/filters.html#feMorphologyElement

Bug: skia:10841
Change-Id: I0b0028fb815c490670f9f1e888770efb194a8f3b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/356107
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Tyler Denniston <tdenniston@google.com>
diff --git a/modules/svg/include/SkSVGFe.h b/modules/svg/include/SkSVGFe.h
index 155634b..ac4d8c4 100644
--- a/modules/svg/include/SkSVGFe.h
+++ b/modules/svg/include/SkSVGFe.h
@@ -21,7 +21,7 @@
         return node->tag() == SkSVGTag::kFeTurbulence || node->tag() == SkSVGTag::kFeColorMatrix ||
                node->tag() == SkSVGTag::kFeComposite || node->tag() == SkSVGTag::kFeFlood ||
                node->tag() == SkSVGTag::kFeGaussianBlur || node->tag() == SkSVGTag::kFeOffset ||
-               node->tag() == SkSVGTag::kFeBlend;
+               node->tag() == SkSVGTag::kFeBlend || node->tag() == SkSVGTag::kFeMorphology;
     }
 
     sk_sp<SkImageFilter> makeImageFilter(const SkSVGRenderContext& ctx,