Change Widget subclasses to use a CullRect instead of an IntRect for painting.

third_party/WebKit/Source/platform/scroll/Scrollbar.cpp

 /*
  * Copyright (C) 2004, 2006, 2008 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:
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 11 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "platform/scroll/Scrollbar.h"
 
 #include <algorithm>
 #include "platform/PlatformGestureEvent.h"
 #include "platform/PlatformMouseEvent.h"
+#include "platform/graphics/paint/CullRect.h"
 #include "platform/scroll/ScrollAnimator.h"
 #include "platform/scroll/ScrollableArea.h"
 #include "platform/scroll/ScrollbarTheme.h"
 
 #if ((OS(POSIX) && !OS(MACOSX)) || OS(WIN))
 // The position of the scrollbar thumb affects the appearance of the steppers, so
 // when the thumb moves, we have to invalidate them for painting.
 #define THUMB_POSITION_AFFECTS_BUTTONS
 #endif
 
@@ skipping 127 matching lines @@
 void Scrollbar::updateThumbPosition()
 {
     updateThumb();
 }
 
 void Scrollbar::updateThumbProportion()
 {
     updateThumb();
 }
 
-void Scrollbar::paint(GraphicsContext* context, const IntRect& damageRect) const
+void Scrollbar::paint(GraphicsContext* context, const CullRect& cullRect) const
 {
-    if (!frameRect().intersects(damageRect))
+    if (!cullRect.intersectsCullRect(frameRect()))
         return;
 
-    if (!theme()->paint(this, context, damageRect))
-        Widget::paint(context, damageRect);
+    if (!theme()->paint(this, context, cullRect))
+        Widget::paint(context, cullRect);
 }
 
 void Scrollbar::autoscrollTimerFired(Timer<Scrollbar>*)
 {
     autoscrollPressedPart(theme()->autoscrollTimerDelay());
 }
 
 static bool thumbUnderMouse(Scrollbar* scrollbar)
 {
     int thumbPos = scrollbar->theme()->trackPosition(scrollbar) + scrollbar->theme()->thumbPosition(scrollbar);
@@ skipping 360 matching lines @@
     if (!m_scrollableArea)
         return 0;
 
     if (m_orientation == HorizontalScrollbar)
         return m_scrollableArea->scrollPosition().x() - m_scrollableArea->minimumScrollPosition().x();
 
     return m_scrollableArea->scrollPosition().y() - m_scrollableArea->minimumScrollPosition().y();
 }
 
 } // namespace blink