[SVGDom] Opacity optimization

experimental/svg/model/SkSVGNode.cpp

Index: experimental/svg/model/SkSVGNode.cpp
diff --git a/experimental/svg/model/SkSVGNode.cpp b/experimental/svg/model/SkSVGNode.cpp
index 012c7d22779bff7db48bb26fe90c6c0d7a24dce6..f40ee5dadb16896795cf991ff3eb6e2cdeb587f2 100644
--- a/experimental/svg/model/SkSVGNode.cpp
+++ b/experimental/svg/model/SkSVGNode.cpp
@@ -31,7 +31,8 @@ bool SkSVGNode::asPaint(const SkSVGRenderContext& ctx, SkPaint* paint) const {
 }
 
 bool SkSVGNode::onPrepareToRender(SkSVGRenderContext* ctx) const {
-    ctx->applyPresentationAttributes(fPresentationAttributes);
+    ctx->applyPresentationAttributes(fPresentationAttributes,
+                                     this->hasChildren() ? 0 : SkSVGRenderContext::kLeaf);
     return true;
 }