Mac/Linux: Ensure window size constraints propagate to the window server during Init

ui/views/test/widget_test_mac.mm

Index: ui/views/test/widget_test_mac.mm
diff --git a/ui/views/test/widget_test_mac.mm b/ui/views/test/widget_test_mac.mm
index 523e31d0aaa409df4f7f23e72993debadb924f43..2f1698dadd2bf55e4b79d72c6122a9b0f63e88aa 100644
--- a/ui/views/test/widget_test_mac.mm
+++ b/ui/views/test/widget_test_mac.mm
@@ -73,6 +73,11 @@ bool WidgetTest::IsWindowStackedAbove(Widget* above, Widget* below) {
 }
 
 // static
+gfx::Size WidgetTest::GetNativeWidgetMinimumContentSize(Widget* widget) {
+  return gfx::Size([widget->GetNativeWindow() contentMinSize]);
+}
+
+// static
 ui::EventProcessor* WidgetTest::GetEventProcessor(Widget* widget) {
   return static_cast<internal::RootView*>(widget->GetRootView());
 }