[WIP] do something :-)

Source/core/layout/LayoutObject.cpp

Index: Source/core/layout/LayoutObject.cpp
diff --git a/Source/core/layout/LayoutObject.cpp b/Source/core/layout/LayoutObject.cpp
index b197aefe32cca310ed1bc3fc7369cfddb28585bd..09cd278a316051ac7c80ead32bf16eb6b03ebecd 100644
--- a/Source/core/layout/LayoutObject.cpp
+++ b/Source/core/layout/LayoutObject.cpp
@@ -88,6 +88,7 @@
 #include "platform/graphics/paint/DisplayItemList.h"
 #include "wtf/Partitions.h"
 #include "wtf/RefCountedLeakCounter.h"
+#include "wtf/SizeAssertions.h"
 #include "wtf/text/StringBuilder.h"
 #include "wtf/text/WTFString.h"
 #include <algorithm>
@@ -107,6 +108,8 @@ static bool gDisablePaintInvalidationStateAsserts = false;
 
 using namespace HTMLNames;
 
+ASSERT_SIZE(LayoutObject, 56, 80);
+
 const LayoutUnit& caretWidth()
 {
     static LayoutUnit gCaretWidth(1);
@@ -114,7 +117,6 @@ const LayoutUnit& caretWidth()
 }
 
 #if ENABLE(ASSERT)
-
 LayoutObject::SetLayoutNeededForbiddenScope::SetLayoutNeededForbiddenScope(LayoutObject& layoutObject)
     : m_layoutObject(layoutObject)
     , m_preexistingForbidden(m_layoutObject.isSetNeedsLayoutForbidden())
@@ -128,20 +130,6 @@ LayoutObject::SetLayoutNeededForbiddenScope::~SetLayoutNeededForbiddenScope()
 }
 #endif
 
-struct SameSizeAsLayoutObject {
-    virtual ~SameSizeAsLayoutObject() { } // Allocate vtable pointer.
-    void* pointers[5];
-#if ENABLE(ASSERT)
-    unsigned m_debugBitfields : 2;
-#endif
-    unsigned m_bitfields;
-    unsigned m_bitfields2;
-    LayoutRect rect; // Stores the previous paint invalidation rect.
-    LayoutPoint position; // Stores the previous position from the paint invalidation container.
-};
-
-static_assert(sizeof(LayoutObject) == sizeof(SameSizeAsLayoutObject), "LayoutObject should stay small");
-
 bool LayoutObject::s_affectsParentBlock = false;
 
 typedef HashMap<const LayoutObject*, LayoutRect> SelectionPaintInvalidationMap;