[WIP] do something :-)

Source/platform/scroll/ScrollableArea.cpp

 /*
  * Copyright (c) 2010, Google Inc. All rights reserved.
  * Copyright (C) 2008, 2011 Apple 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 23 matching lines @@
 
 #include "platform/HostWindow.h"
 #include "platform/Logging.h"
 #include "platform/geometry/DoubleRect.h"
 #include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/LayoutRect.h"
 #include "platform/graphics/GraphicsLayer.h"
 #include "platform/scroll/ProgrammaticScrollAnimator.h"
 #include "platform/scroll/ScrollbarTheme.h"
 #include "wtf/PassOwnPtr.h"
+#include "wtf/SizeAssertions.h"
 
 #include "platform/TraceEvent.h"
 
 static const int kPixelsPerLineStep = 40;
 static const float kMinFractionToStepWhenPaging = 0.875f;
 
 namespace blink {
 
-struct SameSizeAsScrollableArea {
-    virtual ~SameSizeAsScrollableArea();
-    IntRect scrollbarDamage[2];
-#if ENABLE(ASSERT) && ENABLE(OILPAN)
-    VerifyEagerFinalization verifyEager;
-#endif
-    void* pointer;
-    unsigned bitfields : 16;
-    IntPoint origin;
-};
-
-static_assert(sizeof(ScrollableArea) == sizeof(SameSizeAsScrollableArea), "ScrollableArea should stay small");
+ASSERT_SIZE(ScrollableArea, 52, 64);
 
 int ScrollableArea::pixelsPerLineStep()
 {
     return kPixelsPerLineStep;
 }
 
 float ScrollableArea::minFractionToStepWhenPaging()
 {
     return kMinFractionToStepWhenPaging;
 }
@@ skipping 526 matching lines @@
         verticalScrollbarWidth = !verticalBar->isOverlayScrollbar() ? verticalBar->width() : 0;
     if (Scrollbar* horizontalBar = horizontalScrollbar())
         horizontalScrollbarHeight = !horizontalBar->isOverlayScrollbar() ? horizontalBar->height() : 0;
 
     return IntSize(std::max(0, size.width() - verticalScrollbarWidth),
         std::max(0, size.height() - horizontalScrollbarHeight));
 
 }
 
 } // namespace blink