Specify a default display UI scale to reset the zoom to

ash/wm/ash_native_cursor_manager_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 "ash/wm/ash_native_cursor_manager.h"
 
 #include "ash/display/display_manager.h"
 #include "ash/display/display_util.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/test/cursor_manager_test_api.h"
+#include "ash/test/display_manager_test_api.h"
 #include "ui/aura/test/aura_test_utils.h"
 #include "ui/aura/test/test_window_delegate.h"
 #include "ui/aura/test/test_windows.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/base/cursor/image_cursors.h"
 #include "ui/display/screen.h"
 
 #if defined(OS_WIN)
 #include "base/win/windows_version.h"
@@ skipping 154 matching lines @@
 #else
 #define MAYBE_UIScaleShouldNotChangeCursor UIScaleShouldNotChangeCursor
 #endif
 TEST_F(AshNativeCursorManagerTest, MAYBE_UIScaleShouldNotChangeCursor) {
   int64_t display_id = display::Screen::GetScreen()->GetPrimaryDisplay().id();
   display::Display::SetInternalDisplayId(display_id);
 
   ::wm::CursorManager* cursor_manager = Shell::GetInstance()->cursor_manager();
   CursorManagerTestApi test_api(cursor_manager);
 
-  Shell::GetInstance()->display_manager()->SetDisplayUIScale(display_id, 0.5f);
+  test::DisplayManagerTestApi(Shell::GetInstance()->display_manager())
+      .SetDisplayUIScale(display_id, 0.5f);
   EXPECT_EQ(
       1.0f,
       display::Screen::GetScreen()->GetPrimaryDisplay().device_scale_factor());
   EXPECT_EQ(1.0f, test_api.GetCurrentCursor().device_scale_factor());
 
-  Shell::GetInstance()->display_manager()->SetDisplayUIScale(display_id, 1.0f);
+  test::DisplayManagerTestApi(Shell::GetInstance()->display_manager())
+      .SetDisplayUIScale(display_id, 1.0f);
 
   // 2x display should keep using 2x cursor regardless of the UI scale.
   UpdateDisplay("800x800*2");
   EXPECT_EQ(
       2.0f,
       display::Screen::GetScreen()->GetPrimaryDisplay().device_scale_factor());
   EXPECT_EQ(2.0f, test_api.GetCurrentCursor().device_scale_factor());
-  Shell::GetInstance()->display_manager()->SetDisplayUIScale(display_id, 2.0f);
+  test::DisplayManagerTestApi(Shell::GetInstance()->display_manager())
+      .SetDisplayUIScale(display_id, 2.0f);
   EXPECT_EQ(
       1.0f,
       display::Screen::GetScreen()->GetPrimaryDisplay().device_scale_factor());
   EXPECT_EQ(2.0f, test_api.GetCurrentCursor().device_scale_factor());
 }
 
 #if defined(USE_X11)
 // This test is in ash_unittests because ui_base_unittests does not include
 // 2x assets. crbug.com/372541.
 TEST_F(AshNativeCursorManagerTest, CursorLoaderX11Test) {
@@ skipping 11 matching lines @@
   loader.set_scale(2.0f);
   loader.LoadImageCursor(kCursorId, IDR_AURA_CURSOR_MOVE, gfx::Point());
   image = loader.GetXcursorImageForTest(kCursorId);
   EXPECT_EQ(height * 2, static_cast<int>(image->height));
   EXPECT_EQ(width * 2, static_cast<int>(image->width));
 }
 #endif
 
 }  // namespace test
 }  // namespace ash