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

Source/core/layout/compositing/CompositingRequirementsUpdater.h

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2014 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 11 matching lines @@
  * 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 CompositingRequirementsUpdater_h
 #define CompositingRequirementsUpdater_h
 
 #include "platform/geometry/IntRect.h"
 #include "platform/graphics/CompositingReasons.h"
+#include "wtf/Allocator.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class CompositingReasonFinder;
 class DeprecatedPaintLayer;
 class LayoutView;
 
 class CompositingRequirementsUpdater {
+    STACK_ALLOCATED();
 public:
     CompositingRequirementsUpdater(LayoutView&, CompositingReasonFinder&);
     ~CompositingRequirementsUpdater();
 
     //  Recurse through the layers in z-index and overflow order (which is equivalent to painting order)
     //  For the z-order children of a compositing layer:
     //      If a child layers has a compositing layer, then all subsequent layers must
     //      be compositing in order to render above that layer.
     //
     //      If a child in the negative z-order list is compositing, then the layer itself
     //      must be compositing so that its contents render over that child.
     //      This implies that its positive z-index children must also be compositing.
     //
     void update(DeprecatedPaintLayer* root);
 
 private:
     class OverlapMap;
     class RecursionData;
 
     void updateRecursive(DeprecatedPaintLayer* ancestorLayer, DeprecatedPaintLayer* currentLayer, OverlapMap&, RecursionData&, bool& descendantHas3DTransform, Vector<DeprecatedPaintLayer*>& unclippedDescendants, IntRect& absoluteDecendantBoundingBox);
 
     LayoutView& m_layoutView;
     CompositingReasonFinder& m_compositingReasonFinder;
 };
 
 } // namespace blink
 
 #endif // CompositingRequirementsUpdater_h