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

Source/core/paint/EmbeddedObjectPainter.h

Index: Source/core/paint/EmbeddedObjectPainter.h
diff --git a/Source/core/paint/EmbeddedObjectPainter.h b/Source/core/paint/EmbeddedObjectPainter.h
index 7bb7094f56a0c53d1974ad92a826e7b802f4e041..b8b45357de245153ae4d9a25593321114cc14172 100644
--- a/Source/core/paint/EmbeddedObjectPainter.h
+++ b/Source/core/paint/EmbeddedObjectPainter.h
@@ -5,6 +5,8 @@
 #ifndef EmbeddedObjectPainter_h
 #define EmbeddedObjectPainter_h
 
+#include "wtf/Allocator.h"
+
 namespace blink {
 
 struct PaintInfo;
@@ -16,6 +18,7 @@ class Path;
 class TextRun;
 
 class EmbeddedObjectPainter {
+    STACK_ALLOCATED();
 public:
     EmbeddedObjectPainter(LayoutEmbeddedObject& layoutEmbeddedObject) : m_layoutEmbeddedObject(layoutEmbeddedObject) { }