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

Source/core/paint/RoundedInnerRectClipper.h

Index: Source/core/paint/RoundedInnerRectClipper.h
diff --git a/Source/core/paint/RoundedInnerRectClipper.h b/Source/core/paint/RoundedInnerRectClipper.h
index d400b43156d05b900d4831464bf727f28f700b59..b802b2d9e92f60245e703b34defc244fe7080261 100644
--- a/Source/core/paint/RoundedInnerRectClipper.h
+++ b/Source/core/paint/RoundedInnerRectClipper.h
@@ -6,6 +6,7 @@
 #define RoundedInnerRectClipper_h
 
 #include "platform/graphics/paint/DisplayItem.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
@@ -20,6 +21,7 @@ enum RoundedInnerRectClipperBehavior {
 };
 
 class RoundedInnerRectClipper {
+    ALLOW_ONLY_INLINE_ALLOCATION();
 public:
     RoundedInnerRectClipper(LayoutObject&, const PaintInfo&, const LayoutRect&, const FloatRoundedRect& clipRect, RoundedInnerRectClipperBehavior);
     ~RoundedInnerRectClipper();