Don't expand empty rect during rect mapping

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

Index: third_party/WebKit/Source/core/layout/LayoutBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBox.cpp b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
index 91f24af7830c77cb38e2ba32e72d14cb5c2dec08..6c86ce92d863e140f42445988c3325b06ed7d0c0 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
@@ -2328,7 +2328,9 @@ bool LayoutBox::mapToVisualRectInAncestorSpace(
     // for painted elements within the transform since we don't know the desired
     // subpixel accumulation at this point, and the transform may include a
     // scale.
-    rect = LayoutRect(layer()->transform()->mapRect(enclosingIntRect(rect)));
+    FloatRect floatRect =
+        rect.isEmpty() ? FloatRect(rect) : FloatRect(enclosingIntRect(rect));
+    rect = LayoutRect(layer()->transform()->mapRect(floatRect));
   }
   LayoutPoint topLeft = rect.location();
   if (container->isBox()) {