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

Source/core/paint/ScopeRecorder.h

Index: Source/core/paint/ScopeRecorder.h
diff --git a/Source/core/paint/ScopeRecorder.h b/Source/core/paint/ScopeRecorder.h
index c209b93603aebddb2f7e6156bf788de34b647153..99ac59ca10dad2dd48da95776bc7c9a1392cda11 100644
--- a/Source/core/paint/ScopeRecorder.h
+++ b/Source/core/paint/ScopeRecorder.h
@@ -7,6 +7,7 @@
 
 #include "core/CoreExport.h"
 #include "platform/graphics/paint/DisplayItem.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
@@ -15,6 +16,7 @@ class GraphicsContext;
 class LayoutObject;
 
 class CORE_EXPORT ScopeRecorder {
+    ALLOW_ONLY_INLINE_ALLOCATION();
 public:
     ScopeRecorder(GraphicsContext&);