Fix bottom padding on flex boxes with overflow.

Source/core/rendering/RenderFlexibleBox.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 323 matching lines @@
 
 LayoutUnit RenderFlexibleBox::clientLogicalBottomAfterRepositioning()
 {
     LayoutUnit maxChildLogicalBottom = 0;
     for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {
         if (child->isOutOfFlowPositioned())
             continue;
         LayoutUnit childLogicalBottom = logicalTopForChild(child) + logicalHeightForChild(child) + marginAfterForChild(child);
         maxChildLogicalBottom = std::max(maxChildLogicalBottom, childLogicalBottom);
     }
-    return std::max(clientLogicalBottom(), maxChildLogicalBottom);
+    return std::max(clientLogicalBottom(), maxChildLogicalBottom + paddingAfter());
 }
 
 bool RenderFlexibleBox::hasOrthogonalFlow(RenderBox* child) const
 {
     // FIXME: If the child is a flexbox, then we need to check isHorizontalFlow.
     return isHorizontalFlow() != child->isHorizontalWritingMode();
 }
 
 bool RenderFlexibleBox::isColumnFlow() const
 {
@@ skipping 1001 matching lines @@
             ASSERT(child);
             LayoutUnit lineCrossAxisExtent = lineContexts[lineNumber].crossAxisExtent;
             LayoutUnit originalOffset = lineContexts[lineNumber].crossAxisOffset - crossAxisStartEdge;
             LayoutUnit newOffset = contentExtent - originalOffset - lineCrossAxisExtent;
             adjustAlignmentForChild(child, newOffset - originalOffset);
         }
     }
 }
 
 }