Delay scrollContents until the next paint

Source/core/rendering/RenderLayer.cpp

Index: Source/core/rendering/RenderLayer.cpp
diff --git a/Source/core/rendering/RenderLayer.cpp b/Source/core/rendering/RenderLayer.cpp
index 2bf77db422f5707a56f4a906df7b2dda6eaa3d09..c21e89701d07c67246a4d45639c2c33813c875a5 100644
--- a/Source/core/rendering/RenderLayer.cpp
+++ b/Source/core/rendering/RenderLayer.cpp
@@ -496,11 +496,7 @@ void RenderLayer::updateLayerPositionsAfterScroll(RenderGeometryMap* geometryMap
     if (renderer()->hasOverflowClip())
         flags |= HasSeenAncestorWithOverflowClip;
 
-    if (flags & HasSeenViewportConstrainedAncestor
-        || (flags & IsOverflowScroll && flags & HasSeenAncestorWithOverflowClip && !m_canSkipRepaintRectsUpdateOnScroll)) {
-        // FIXME: Remove incremental compositing updates after fixing the chicken/egg issues
-        // https://code.google.com/p/chromium/issues/detail?id=343756
-        DisableCompositingQueryAsserts disabler;
+    if (flags & IsOverflowScroll && flags & HasSeenAncestorWithOverflowClip && !m_canSkipRepaintRectsUpdateOnScroll) {

[esprehn, 2014/03/24 21:50:43]

Add parens around & cases. This is hard to read, we should fix the ones at the
top too.

[ykyyip, 2014/03/24 22:15:03]

Done.

         // FIXME: We could track the repaint container as we walk down the tree.
         repainter().computeRepaintRects(renderer()->containerForRepaint(), geometryMap);
     } else {