Converts most of WorkspaceLayoutManager tests to use common code

ash/mus/test/ash_test_impl_mus.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/ash_test_impl_mus.h"
 
 #include "ash/common/test/ash_test.h"
 #include "ash/mus/bridge/wm_window_mus.h"
 #include "base/memory/ptr_util.h"
 #include "services/ui/public/cpp/property_type_converters.h"
@@ skipping 47 matching lines @@
 std::unique_ptr<WindowOwner> AshTestImplMus::CreateTestWindow(
     const gfx::Rect& bounds_in_screen,
     ui::wm::WindowType type,
     int shell_window_id) {
   WmWindowMus* window =
       WmWindowMus::Get(wm_test_base_->CreateTestWindow(bounds_in_screen, type));
   window->SetShellWindowId(shell_window_id);
   return base::MakeUnique<WindowOwner>(window);
 }
 
+std::unique_ptr<WindowOwner> AshTestImplMus::CreateToplevelTestWindow(
+    const gfx::Rect& bounds_in_screen,
+    int shell_window_id) {
+  // For mus CreateTestWindow() creates top level windows (assuming
+  // WINDOW_TYPE_NORMAL).
+  return CreateTestWindow(bounds_in_screen, ui::wm::WINDOW_TYPE_NORMAL,
+                          shell_window_id);
+}
+
 display::Display AshTestImplMus::GetSecondaryDisplay() {
   return wm_test_base_->GetSecondaryDisplay();
 }
 
 bool AshTestImplMus::SetSecondaryDisplayPlacement(
     display::DisplayPlacement::Position position,
     int offset) {
   NOTIMPLEMENTED();
   return false;
 }
 
+void AshTestImplMus::ConfigureWidgetInitParamsForDisplay(
+    WmWindow* window,
+    views::Widget::InitParams* init_params) {
+  init_params
+      ->mus_properties[ui::mojom::WindowManager::kInitialDisplayId_Property] =
+      mojo::ConvertTo<std::vector<uint8_t>>(
+          WmWindowMus::GetMusWindow(window)->display_id());
+}
+
+void AshTestImplMus::AddTransientChild(WmWindow* parent, WmWindow* window) {
+  WmWindowMus::GetMusWindow(parent)->AddTransientWindow(
+      WmWindowMus::GetMusWindow(window));
+}
+
 }  // namespace mus
 
 // static
 std::unique_ptr<AshTestImpl> AshTestImpl::Create() {
   return base::MakeUnique<mus::AshTestImplMus>();
 }
 
 }  // namespace ash