Backfill some UI tests.

ui/views/window/dialog_client_view_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/window/dialog_client_view.h"
 
 #include <map>
 
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 402 matching lines @@
   // Remove |extra_button| from the View hierarchy so that it can be replaced.
   delete extra_button;
 
   // Non-buttons should always be sized to their preferred size.
   View* boring_view = new StaticSizedView(gfx::Size(20, 20));
   SetExtraView(boring_view);
   CheckContentsIsSetToPreferredSize();
   EXPECT_EQ(20, boring_view->width());
 }
 
+TEST_F(DialogClientViewTest, ButtonPosition) {
+  constexpr int button_row_inset = 13;
+  client_view()->SetButtonRowInsets(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