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

Source/core/paint/ImagePainter.h

Index: Source/core/paint/ImagePainter.h
diff --git a/Source/core/paint/ImagePainter.h b/Source/core/paint/ImagePainter.h
index 8fabf2742b7681897985e017de529f7481ed0dcf..3455a2f456469da31531e84d78de65bed87e6abc 100644
--- a/Source/core/paint/ImagePainter.h
+++ b/Source/core/paint/ImagePainter.h
@@ -5,6 +5,8 @@
 #ifndef ImagePainter_h
 #define ImagePainter_h
 
+#include "wtf/Allocator.h"
+
 namespace blink {
 
 class GraphicsContext;
@@ -14,6 +16,7 @@ class LayoutRect;
 class LayoutImage;
 
 class ImagePainter {
+    STACK_ALLOCATED();
 public:
     ImagePainter(LayoutImage& layoutImage) : m_layoutImage(layoutImage) { }