Mark BackgroundImageGeometry as stack allocated

Source/core/paint/BackgroundImageGeometry.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BackgroundImageGeometry_h
 #define BackgroundImageGeometry_h
 
 #include "platform/geometry/IntPoint.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/geometry/IntSize.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class BackgroundImageGeometry {
+    STACK_ALLOCATED();
 public:
     BackgroundImageGeometry()
         : m_hasNonLocalGeometry(false)
     { }
 
     IntRect destRect() const { return m_destRect; }
     void setDestRect(const IntRect& destRect)
     {
         m_destRect = destRect;
     }
@@ skipping 35 matching lines @@
     IntRect m_destRect;
     IntPoint m_phase;
     IntSize m_tileSize;
     IntSize m_repeatSpacing;
     bool m_hasNonLocalGeometry; // Has background-attachment: fixed. Implies that we can't always cheaply compute destRect.
 };
 
 } // namespace blink
 
 #endif // BackgroundImageGeometry_h