[SVGDom] Add <svg> viewBox support

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 f8667975bd08e1603f2489ba69967aa1e379ca90..4f91b30babde443add9fcb689c391ecc33137a3d 100644
--- a/experimental/svg/model/SkSVGContainer.cpp
+++ b/experimental/svg/model/SkSVGContainer.cpp
@@ -14,8 +14,8 @@ void SkSVGContainer::appendChild(sk_sp<SkSVGNode> node) {
     fChildren.push_back(std::move(node));
 }
 
-void SkSVGContainer::onRender(SkCanvas* canvas, const SkSVGRenderContext& ctx) const {
+void SkSVGContainer::onRender(const SkSVGRenderContext& ctx) const {
     for (int i = 0; i < fChildren.count(); ++i) {
-        fChildren[i]->render(canvas, ctx);
+        fChildren[i]->render(ctx);
     }
 }