Converts most of WorkspaceLayoutManager tests to use common code

ash/mus/test/wm_test_base.cc

 // Copyright 2016 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/mus/test/wm_test_base.h"
 
 #include <algorithm>
 #include <vector>
 
+#include "ash/mus/bridge/wm_window_mus_test_api.h"
 #include "ash/mus/root_window_controller.h"
 #include "ash/mus/test/wm_test_helper.h"
 #include "ash/mus/window_manager.h"
 #include "ash/mus/window_manager_application.h"
 #include "services/ui/public/cpp/property_type_converters.h"
 #include "services/ui/public/cpp/window_tree_client.h"
 #include "ui/display/display.h"
 
 namespace ash {
 namespace mus {
@@ skipping 90 matching lines @@
   properties[ui::mojom::WindowManager::kResizeBehavior_Property] =
       mojo::ConvertTo<std::vector<uint8_t>>(
           ui::mojom::kResizeBehaviorCanResize |
           ui::mojom::kResizeBehaviorCanMaximize |
           ui::mojom::kResizeBehaviorCanMinimize);
 
   ui::Window* window = test_helper_->GetRootsOrderedByDisplayId()[0]
                            ->window_manager()
                            ->NewTopLevelWindow(&properties);
   window->SetVisible(true);
+  // Most tests expect a minimum size of 0x0.
+  WmWindowMusTestApi(WmWindowMus::Get(window)).set_use_empty_minimum_size(true);
   return window;
 }
 
 ui::Window* WmTestBase::CreateFullscreenTestWindow() {
   std::map<std::string, std::vector<uint8_t>> properties;
   properties[ui::mojom::WindowManager::kShowState_Property] =
       mojo::ConvertTo<std::vector<uint8_t>>(
           static_cast<int32_t>(ui::mojom::ShowState::FULLSCREEN));
   ui::Window* window = test_helper_->GetRootsOrderedByDisplayId()[0]
                            ->window_manager()
@@ skipping 24 matching lines @@
   test_helper_->Init();
 }
 
 void WmTestBase::TearDown() {
   teardown_called_ = true;
   test_helper_.reset();
 }
 
 }  // namespace mus
 }  // namespace ash