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

Source/core/paint/DeprecatedPaintLayerPainter.h

Index: Source/core/paint/DeprecatedPaintLayerPainter.h
diff --git a/Source/core/paint/DeprecatedPaintLayerPainter.h b/Source/core/paint/DeprecatedPaintLayerPainter.h
index 1c4ef5f207e9ea60a92835f3230210b298635b29..9c0fe9f0707ca751ef67b59cee1c2618e09050b1 100644
--- a/Source/core/paint/DeprecatedPaintLayerPainter.h
+++ b/Source/core/paint/DeprecatedPaintLayerPainter.h
@@ -8,6 +8,7 @@
 #include "core/CoreExport.h"
 #include "core/paint/DeprecatedPaintLayerFragment.h"
 #include "core/paint/DeprecatedPaintLayerPaintingInfo.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
@@ -17,6 +18,7 @@ class GraphicsContext;
 class LayoutPoint;
 
 class CORE_EXPORT DeprecatedPaintLayerPainter {
+    STACK_ALLOCATED();
 public:
     enum FragmentPolicy { AllowMultipleFragments, ForceSingleFragment };