Recompute overflow after transform changes

Source/core/rendering/RenderBlock.cpp

Index: Source/core/rendering/RenderBlock.cpp
diff --git a/Source/core/rendering/RenderBlock.cpp b/Source/core/rendering/RenderBlock.cpp
index fbcc31eb3c1ddbed2c55e49fdf3f75103d6adc04..e5c6e7fc426041e481f030be36d8bf9c10a70155 100644
--- a/Source/core/rendering/RenderBlock.cpp
+++ b/Source/core/rendering/RenderBlock.cpp
@@ -1516,6 +1516,14 @@ void RenderBlock::addOverflowFromChildren()
     }
 }
 
+void RenderBlock::updateOverflowForTransform()
+{
+    LayoutUnit oldClientAfterEdge = hasRenderOverflow() ? m_overflow->layoutClientAfterEdge() : clientLogicalBottom();
+    computeOverflow(oldClientAfterEdge, true);
+    if (hasOverflowClip())
+        layer()->scrollableArea()->updateAfterOverflowRecalc();
+}
+
 void RenderBlock::computeOverflow(LayoutUnit oldClientAfterEdge, bool)
 {
     m_overflow.clear();