[SVGDom] Add opacity support

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 a039b59ff16865a5df70c8c30e2bdac3f9f69262..5a73ace548cfd71b1d2879bca7538a2e94616e6f 100644
--- a/experimental/svg/model/SkSVGNode.cpp
+++ b/experimental/svg/model/SkSVGNode.cpp
@@ -42,6 +42,11 @@ void SkSVGNode::setFillOpacity(const SkSVGNumberType& opacity) {
         SkSVGNumberType(SkTPin<SkScalar>(opacity.value(), 0, 1)));
 }
 
+void SkSVGNode::setOpacity(const SkSVGNumberType& opacity) {
+    fPresentationAttributes.fOpacity.set(
+        SkSVGNumberType(SkTPin<SkScalar>(opacity.value(), 0, 1)));
+}
+
 void SkSVGNode::setStroke(const SkSVGPaint& svgPaint) {
     fPresentationAttributes.fStroke.set(svgPaint);
 }
@@ -67,6 +72,11 @@ void SkSVGNode::onSetAttribute(SkSVGAttribute attr, const SkSVGValue& v) {
             this->setFillOpacity(*opacity);
         }
         break;
+    case SkSVGAttribute::kOpacity:
+        if (const SkSVGNumberValue* opacity = v.as<SkSVGNumberValue>()) {
+            this->setOpacity(*opacity);
+        }
+        break;
     case SkSVGAttribute::kStroke:
         if (const SkSVGPaintValue* paint = v.as<SkSVGPaintValue>()) {
             this->setStroke(*paint);