ui: ToEnclosingRect(empty rect) should return an empty rect.

ui/gfx/rect_conversions.cc

Index: ui/gfx/rect_conversions.cc
diff --git a/ui/gfx/rect_conversions.cc b/ui/gfx/rect_conversions.cc
index c548828aa2a9662b023e8421d1511f6e5fd3d937..ac7767b3204de84881b752a43c5c4a09d3e18744 100644
--- a/ui/gfx/rect_conversions.cc
+++ b/ui/gfx/rect_conversions.cc
@@ -16,8 +16,8 @@ Rect ToEnclosingRect(const RectF& rect) {
   int min_y = ToFlooredInt(rect.y());
   float max_x = rect.right();
   float max_y = rect.bottom();
-  int width = std::max(ToCeiledInt(max_x) - min_x, 0);
-  int height = std::max(ToCeiledInt(max_y) - min_y, 0);
+  int width = rect.width() == 0 ? 0 : std::max(ToCeiledInt(max_x) - min_x, 0);
+  int height = rect.height() == 0 ? 0 : std::max(ToCeiledInt(max_y) - min_y, 0);
   return Rect(min_x, min_y, width, height);
 }