[WIP] do something :-)

Source/platform/graphics/paint/DisplayItem.cpp

 // 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.
 
 #include "config.h"
 #include "platform/graphics/paint/DisplayItem.h"
 
+#include "wtf/SizeAssertions.h"
+
 namespace blink {
 
-struct SameSizeAsDisplayItem {
-    virtual ~SameSizeAsDisplayItem() { } // Allocate vtable pointer.
-    void* pointer;
-    int ints[2]; // Make sure other fields are packed into two ints.
-#ifndef NDEBUG
-    WTF::String m_debugString;
-#endif
-};
-static_assert(sizeof(DisplayItem) == sizeof(SameSizeAsDisplayItem), "DisplayItem should stay small");
+ASSERT_SIZE(DisplayItem, 16, 24);
 
 #ifndef NDEBUG
 
 static WTF::String paintPhaseAsDebugString(int paintPhase)
 {
     // Must be kept in sync with PaintPhase.
     switch (paintPhase) {
     case 0: return "PaintPhaseBlockBackground";
     case 1: return "PaintPhaseChildBlockBackground";
     case 2: return "PaintPhaseChildBlockBackgrounds";
@@ skipping 196 matching lines @@
     stringBuilder.append('"');
     if (m_skippedCache)
         stringBuilder.append(", skippedCache: true");
     if (m_scope)
         stringBuilder.append(String::format(", scope: %d", m_scope));
 }
 
 #endif
 
 } // namespace blink