2 files changed, 10 insertions, 2 deletions
diff --git a/ui/gfx/box_f.cc b/ui/gfx/box_f.cc
index b4191f3..62e755b 100644
--- a/ui/gfx/box_f.cc
+++ b/ui/gfx/box_f.cc
@@ -50,14 +50,17 @@ void BoxF::Union(const BoxF& box) {
   }
   if (box.IsEmpty())
     return;
-
-  ExpandTo(box.origin(), gfx::Point3F(box.right(), box.bottom(), box.front()));
+  ExpandTo(box);
 }
 
 void BoxF::ExpandTo(const Point3F& point) {
   ExpandTo(point, point);
 }
 
+void BoxF::ExpandTo(const BoxF& box) {
+  ExpandTo(box.origin(), gfx::Point3F(box.right(), box.bottom(), box.front()));
+}
+
 BoxF UnionBoxes(const BoxF& a, const BoxF& b) {
   BoxF result = a;
   result.Union(b);
diff --git a/ui/gfx/box_f.h b/ui/gfx/box_f.h
index 11770ee..73e0972 100644
--- a/ui/gfx/box_f.h
+++ b/ui/gfx/box_f.h
@@ -99,6 +99,11 @@ class GFX_EXPORT BoxF {
   // |origin_|.
   void ExpandTo(const Point3F& point);
 
+  // Expands |this| to contain the given box, if necessary. Please note, even
+  // if |this| is empty, after the function |this| will continue to contain its
+  // |origin_|.
+  void ExpandTo(const BoxF& box);
+
  private:
   // Expands the box to contain the two given points. It is required that each
   // component of |min| is less than or equal to the corresponding component in