Make classes and structures in web fast-allocated.

Source/web/painting/PaintAggregator.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef PaintAggregator_h
 #define PaintAggregator_h
 
 #include "platform/geometry/IntPoint.h"
 #include "platform/geometry/IntRect.h"
+#include "wtf/Allocator.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 // This class is responsible for aggregating multiple invalidation and scroll
 // commands to produce a scroll and repaint sequence.
 class PaintAggregator {
+    STACK_ALLOCATED();
 public:
     // This structure describes an aggregation of invalidateRect and scrollRect
     // calls. If |scrollRect| is non-empty, then that rect should be scrolled
     // by the amount specified by |scrollDelta|. If |paintRects| is non-empty,
     // then those rects should be repainted. If |scrollRect| and |paintRects|
     // are non-empty, then scrolling should be performed before repainting.
     // |scrollDelta| can only specify scrolling in one direction (i.e., the x
     // and y members cannot both be non-zero).
     struct PendingUpdate {
+        STACK_ALLOCATED();
         PendingUpdate();
         ~PendingUpdate();
 
         // Returns the rect damaged by scrolling within |scrollRect| by
         // |scrollDelta|. This rect must be repainted.
         IntRect calculateScrollDamage() const;
 
         // Returns the smallest rect containing all paint rects.
         IntRect calculatePaintBounds() const;
 
@@ skipping 21 matching lines @@
     bool shouldInvalidateScrollRect(const IntRect&) const;
     void invalidateScrollRect();
     void combinePaintRects();
 
     PendingUpdate m_update;
 };
 
 } // namespace blink
 
 #endif