[SVGDom] Opacity optimization

experimental/svg/model/SkSVGContainer.cpp

Index: experimental/svg/model/SkSVGContainer.cpp
diff --git a/experimental/svg/model/SkSVGContainer.cpp b/experimental/svg/model/SkSVGContainer.cpp
index 4f91b30babde443add9fcb689c391ecc33137a3d..af19608d25036d2fe1e29e76f54c5f294f0e6ddd 100644
--- a/experimental/svg/model/SkSVGContainer.cpp
+++ b/experimental/svg/model/SkSVGContainer.cpp
@@ -14,6 +14,10 @@ void SkSVGContainer::appendChild(sk_sp<SkSVGNode> node) {
     fChildren.push_back(std::move(node));
 }
 
+bool SkSVGContainer::hasChildren() const {
+    return !fChildren.empty();
+}
+
 void SkSVGContainer::onRender(const SkSVGRenderContext& ctx) const {
     for (int i = 0; i < fChildren.count(); ++i) {
         fChildren[i]->render(ctx);