Added allocator matcros to blink classes and structures in core/svg.

Source/core/svg/SVGPathSeg.h

Index: Source/core/svg/SVGPathSeg.h
diff --git a/Source/core/svg/SVGPathSeg.h b/Source/core/svg/SVGPathSeg.h
index 2a26f7703d4b7ef914e61c1ad9af5af3be058922..58422ba672b743edb69933cc024bfdddc9f8ef5c 100644
--- a/Source/core/svg/SVGPathSeg.h
+++ b/Source/core/svg/SVGPathSeg.h
@@ -24,6 +24,7 @@
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "platform/geometry/FloatPoint.h"
 #include "platform/heap/Handle.h"
+#include "wtf/Allocator.h"
 #include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
@@ -73,6 +74,7 @@ static inline bool isAbsolutePathSegType(const SVGPathSegType type)
 }
 
 struct PathSegmentData {
+    STACK_ALLOCATED();
     PathSegmentData()
         : command(PathSegUnknown)
         , arcSweep(false)