Make classes and structures in core/paint fast-allocated.

Source/core/paint/DetailsMarkerPainter.h

Index: Source/core/paint/DetailsMarkerPainter.h
diff --git a/Source/core/paint/DetailsMarkerPainter.h b/Source/core/paint/DetailsMarkerPainter.h
index 361f7144c5c3e66536c384be977ca9bc39734e3f..87f3d4d91a9d00401d280d60e7f9243cbfeac0fc 100644
--- a/Source/core/paint/DetailsMarkerPainter.h
+++ b/Source/core/paint/DetailsMarkerPainter.h
@@ -5,6 +5,8 @@
 #ifndef DetailsMarkerPainter_h
 #define DetailsMarkerPainter_h
 
+#include "wtf/Allocator.h"
+
 namespace blink {
 
 struct PaintInfo;
@@ -13,6 +15,7 @@ class LayoutPoint;
 class LayoutDetailsMarker;
 
 class DetailsMarkerPainter {
+    STACK_ALLOCATED();
 public:
     DetailsMarkerPainter(LayoutDetailsMarker& layoutDetailsMarker) : m_layoutDetailsMarker(layoutDetailsMarker) { }