Converts most of WorkspaceLayoutManager tests to use common code

ash/common/test/ash_test_impl.h

 // 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.
 
 #ifndef ASH_COMMON_TEST_ASH_TEST_IMPL_H_
 #define ASH_COMMON_TEST_ASH_TEST_IMPL_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 25 matching lines @@
 
   // These functions mirror that of AshTest, see it for details.
   virtual void SetUp() = 0;
   virtual void TearDown() = 0;
   virtual bool SupportsMultipleDisplays() const = 0;
   virtual void UpdateDisplay(const std::string& display_spec) = 0;
   virtual std::unique_ptr<WindowOwner> CreateTestWindow(
       const gfx::Rect& bounds_in_screen,
       ui::wm::WindowType type,
       int shell_window_id) = 0;
+  virtual std::unique_ptr<WindowOwner> CreateToplevelTestWindow(
+      const gfx::Rect& bounds_in_screen,
+      int shell_window_id) = 0;
   virtual display::Display GetSecondaryDisplay() = 0;
   virtual bool SetSecondaryDisplayPlacement(
       display::DisplayPlacement::Position position,
       int offset) = 0;
+  virtual void ConfigureWidgetInitParamsForDisplay(
+      WmWindow* window,
+      views::Widget::InitParams* init_params) = 0;
+  virtual void AddTransientChild(WmWindow* parent, WmWindow* window) = 0;
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_TEST_ASH_TEST_IMPL_H_