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

Source/core/layout/LayoutGeometryMapStep.h

 /*
  * Copyright (C) 2012 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 LayoutGeometryMapStep_h
 #define LayoutGeometryMapStep_h
 
 #include "platform/geometry/LayoutSize.h"
 #include "platform/transforms/TransformationMatrix.h"
+#include "wtf/Allocator.h"
 #include "wtf/OwnPtr.h"
 
 namespace blink {
 
 class LayoutObject;
 
 // Stores data about how to map from one layoutObject to its container.
 struct LayoutGeometryMapStep {
+    ALLOW_ONLY_INLINE_ALLOCATION();
     LayoutGeometryMapStep(const LayoutGeometryMapStep& o)
         : m_layoutObject(o.m_layoutObject)
         , m_offset(o.m_offset)
         , m_offsetForFixedPosition(o.m_offsetForFixedPosition)
         , m_accumulatingTransform(o.m_accumulatingTransform)
         , m_isNonUniform(o.m_isNonUniform)
         , m_isFixedPosition(o.m_isFixedPosition)
         , m_hasTransform(o.m_hasTransform)
     {
         ASSERT(!o.m_transform);
@@ skipping 14 matching lines @@
     bool m_isNonUniform; // Mapping depends on the input point, e.g. because of CSS columns.
     bool m_isFixedPosition;
     bool m_hasTransform;
 };
 
 } // namespace blink
 
 WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(blink::LayoutGeometryMapStep);
 
 #endif // LayoutGeometryMapStep_h