[WIP: Not for review] Simplify and unify widget/window show logic

ash/wm/lock_layout_manager_unittest.cc

 // Copyright 2014 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 "ash/display/display_manager.h"
 #include "ash/root_window_controller.h"
 #include "ash/screen_util.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/test/ash_test_base.h"
@@ skipping 22 matching lines @@
  public:
   explicit LoginTestWidgetDelegate(views::Widget* widget) : widget_(widget) {
   }
   ~LoginTestWidgetDelegate() override {}
 
   // Overridden from WidgetDelegate:
   void DeleteDelegate() override { delete this; }
   views::Widget* GetWidget() override { return widget_; }
   const views::Widget* GetWidget() const override { return widget_; }
   bool CanActivate() const override { return true; }
+  bool CanMaximize() const override { return true; }
   bool ShouldAdvanceFocusToTopLevelWidget() const override { return true; }
 
  private:
   views::Widget* widget_;
 
   DISALLOW_COPY_AND_ASSIGN(LoginTestWidgetDelegate);
 };
 
 }  // namespace
 
@@ skipping 239 matching lines @@
       ScreenUtil::GetDisplayWorkAreaBoundsInParent(window.get());
   window->SetBounds(work_area);
   // Usually work_area takes Shelf into account but that doesn't affect
   // LockScreen container windows.
   EXPECT_NE(work_area.ToString(), window->GetBoundsInScreen().ToString());
   EXPECT_EQ(screen_bounds.ToString(), window->GetBoundsInScreen().ToString());
 }
 
 }  // namespace test
 }  // namespace ash