Delay scrollContents until the next paint

Source/core/rendering/RenderView.cpp

Index: Source/core/rendering/RenderView.cpp
diff --git a/Source/core/rendering/RenderView.cpp b/Source/core/rendering/RenderView.cpp
index 1656814b743940e98071c60f4aafacabb0e2487e..27790179accd10240736e7a9f4384d246bd991b3 100644
--- a/Source/core/rendering/RenderView.cpp
+++ b/Source/core/rendering/RenderView.cpp
@@ -496,8 +496,15 @@ void RenderView::computeRectForRepaint(const RenderLayerModelObject* repaintCont
             rect.setX(viewWidth() - rect.maxX());
     }
 
-    if (fixed && m_frameView)
+    if (fixed && m_frameView) {
         rect.move(m_frameView->scrollOffsetForFixedPosition());
+        // If we're in the middle of scrolling, also invalidate the previous scroll position.

[abarth-chromium, 2014/03/08 06:54:52]

I might say that we have a pending scroll delta rather than saying we're in the
middle of a scroll.

[ykyyip, 2014/03/11 01:59:39]

Done.

+        if (!m_frameView->scrollDelta().isZero()) {
+            LayoutRect scrolledPrev = rect;
+            scrolledPrev.move(-m_frameView->scrollDelta());
+            rect.unite(scrolledPrev);
+        }
+    }
 
     // Apply our transform if we have one (because of full page zooming).
     if (!repaintContainer && layer() && layer()->transform())