Backfill some UI tests.

ui/views/window/dialog_client_view_unittest.cc

Index: ui/views/window/dialog_client_view_unittest.cc
diff --git a/ui/views/window/dialog_client_view_unittest.cc b/ui/views/window/dialog_client_view_unittest.cc
index a8d3d8d79c222a876312009c96f65ee9328bfbb9..9fc4c61866f16bc7c43a8bb7b72a2acc54677456 100644
--- a/ui/views/window/dialog_client_view_unittest.cc
+++ b/ui/views/window/dialog_client_view_unittest.cc
@@ -405,4 +405,24 @@ TEST_F(DialogClientViewTest, LinkedWidths) {
   EXPECT_EQ(20, boring_view->width());
 }
 
+TEST_F(DialogClientViewTest, ButtonPosition) {
+  ui::test::MaterialDesignControllerTestAPI md_test_api(
+      ui::MaterialDesignController::MATERIAL_NORMAL);
+  md_test_api.SetSecondaryUiMaterial(true);
+
+  constexpr int button_row_inset = 13;
+  client_view()->set_button_row_insets(gfx::Insets(button_row_inset));
+  constexpr int contents_height = 37;
+  constexpr int contents_width = 222;
+  SetSizeConstraints(gfx::Size(), gfx::Size(contents_width, contents_height),
+                     gfx::Size(666, 666));
+  SetDialogButtons(ui::DIALOG_BUTTON_OK);
+  client_view()->SizeToPreferredSize();
+  client_view()->Layout();
+  EXPECT_EQ(contents_width - button_row_inset,
+            client_view()->ok_button()->bounds().right());
+  EXPECT_EQ(contents_height + button_row_inset,
+            height() + client_view()->ok_button()->y());
+}
+
 }  // namespace views