ui: Prefer +/- operators to apply offsets.

ui/gfx/rect.h

Index: ui/gfx/rect.h
diff --git a/ui/gfx/rect.h b/ui/gfx/rect.h
index 5479d2e2b0319de060fd0d0d73067c9e01bf225e..076f9fc08f525d67b7a8fe75dad2cf9507160d9b 100644
--- a/ui/gfx/rect.h
+++ b/ui/gfx/rect.h
@@ -77,6 +77,13 @@ inline bool operator!=(const Rect& lhs, const Rect& rhs) {
   return !(lhs == rhs);
 }
 
+UI_EXPORT Rect operator+(const Rect& lhs, const Vector2d& rhs);
+UI_EXPORT Rect operator-(const Rect& lhs, const Vector2d& rhs);
+
+inline Rect operator+(const Vector2d& lhs, const Rect& rhs) {
+  return rhs + lhs;
+}
+
 UI_EXPORT Rect IntersectRects(const Rect& a, const Rect& b);
 UI_EXPORT Rect UnionRects(const Rect& a, const Rect& b);
 UI_EXPORT Rect SubtractRects(const Rect& a, const Rect& b);