Reland "Recompute overflow after transform changes"

Source/core/rendering/RenderBlock.h

Index: Source/core/rendering/RenderBlock.h
diff --git a/Source/core/rendering/RenderBlock.h b/Source/core/rendering/RenderBlock.h
index 4758c18ff4bb58332858ef0a76f107704e9be66e..605fd3d7868af7c82ee391757e9bf2a1d43414ac 100644
--- a/Source/core/rendering/RenderBlock.h
+++ b/Source/core/rendering/RenderBlock.h
@@ -262,6 +262,10 @@ public:
     // (grid items, flex items) require this behavior as well, and this function exists as a helper for them.
     // It is expected that the caller will call this function independent of the value of paintInfo.phase.
     static void paintAsInlineBlock(RenderObject*, PaintInfo&, const LayoutPoint&);
+
+    bool recalcChildOverflowAfterStyleChange();
+    bool recalcOverflowAfterStyleChange();
+
 protected:
     virtual void willBeDestroyed() OVERRIDE;