views: support dialog width snapping once and for all

ui/views/layout/layout_provider.cc

Index: ui/views/layout/layout_provider.cc
diff --git a/ui/views/layout/layout_provider.cc b/ui/views/layout/layout_provider.cc
index 926916d16883e0ef5fc29aeb90400eae960e9b71..35b332e2c21957a72a3f4a335a75e832fc21a0f6 100644
--- a/ui/views/layout/layout_provider.cc
+++ b/ui/views/layout/layout_provider.cc
@@ -74,4 +74,8 @@ const TypographyProvider& LayoutProvider::GetTypographyProvider() const {
   return typography_provider_;
 }
 
-}  // namespace views
+int LayoutProvider::GetSnappedDialogWidth(int min_width) const {
+  return min_width;
+}
+
+}  // namespace views