Update PaintLayer size during layout, not after.

third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp

 /*
  * Copyright (C) 2011 Google 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 381 matching lines @@
     if (LogicalHeight() != previous_height)
       relayout_children = true;
 
     LayoutPositionedObjects(relayout_children || IsDocumentElement());
 
     // FIXME: css3/flexbox/repaint-rtl-column.html seems to issue paint
     // invalidations for more overflow than it needs to.
     ComputeOverflow(ClientLogicalBottomAfterRepositioning());
   }
 
-  UpdateLayerTransformAfterLayout();
-
   // We have to reset this, because changes to our ancestors' style can affect
   // this value. Also, this needs to be before we call updateAfterLayout, as
   // that function may re-enter this one.
   has_definite_height_ = SizeDefiniteness::kUnknown;
 
   // Update our scroll information if we're overflow:auto/scroll/hidden now
   // that we know if we overflow or not.
   UpdateAfterLayout();
 
   ClearNeedsLayout();
@@ skipping 1788 matching lines @@
       LayoutUnit original_offset =
           line_contexts[line_number].cross_axis_offset - cross_axis_start_edge;
       LayoutUnit new_offset =
           content_extent - original_offset - line_cross_axis_extent;
       AdjustAlignmentForChild(*flex_item.box, new_offset - original_offset);
     }
   }
 }
 
 }  // namespace blink