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

Source/core/paint/FrameSetPainter.h

Index: Source/core/paint/FrameSetPainter.h
diff --git a/Source/core/paint/FrameSetPainter.h b/Source/core/paint/FrameSetPainter.h
index 8f9b2ebeae76811ef9bf308ce5225b12c9f2fa14..d1d67ccafde73a29fcc363957e2891fd53751536 100644
--- a/Source/core/paint/FrameSetPainter.h
+++ b/Source/core/paint/FrameSetPainter.h
@@ -5,6 +5,8 @@
 #ifndef FrameSetPainter_h
 #define FrameSetPainter_h
 
+#include "wtf/Allocator.h"
+
 namespace blink {
 
 class IntRect;
@@ -13,6 +15,7 @@ class LayoutFrameSet;
 class LayoutPoint;
 
 class FrameSetPainter {
+    STACK_ALLOCATED();
 public:
     FrameSetPainter(LayoutFrameSet& layoutFrameSet) : m_layoutFrameSet(layoutFrameSet) { }