Convert SVG <text> and descendants to use RenderObject::isChildAllowed

Source/core/rendering/svg/RenderSVGTextPath.cpp

Index: Source/core/rendering/svg/RenderSVGTextPath.cpp
diff --git a/Source/core/rendering/svg/RenderSVGTextPath.cpp b/Source/core/rendering/svg/RenderSVGTextPath.cpp
index 20c0049aca17ac1c1afea1af9a00f8f2d8e78dc5..c921c2f84ce59315bd06779f414e266b78ac3454 100644
--- a/Source/core/rendering/svg/RenderSVGTextPath.cpp
+++ b/Source/core/rendering/svg/RenderSVGTextPath.cpp
@@ -23,6 +23,7 @@
 
 #include "SVGNames.h"
 #include "core/rendering/svg/SVGPathData.h"
+#include "core/rendering/svg/SVGRenderSupport.h"
 #include "core/svg/SVGPathElement.h"
 #include "core/svg/SVGTextPathElement.h"
 
@@ -33,6 +34,20 @@ RenderSVGTextPath::RenderSVGTextPath(Element* element)
 {
 }
 
+bool RenderSVGTextPath::isChildAllowed(RenderObject* child, RenderStyle*) const
+{
+    if (child->isText())
+        return !SVGRenderSupport::isEmptySVGInlineText(child);
+
+#if ENABLE(SVG_FONTS)
+    // 'altGlyph' is supported by the content model for 'textPath', but...
+    if (child->node()->hasTagName(SVGNames::altGlyphTag))
+        return false;
+#endif
+
+    return child->isSVGInline() && !child->isSVGTextPath();
+}
+
 Path RenderSVGTextPath::layoutPath() const
 {
     SVGTextPathElement* textPathElement = toSVGTextPathElement(node());