Handles users rotating screen too early

ash/display/display_configuration_controller_unittest.cc

+// Copyright 2017 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_configuration_controller.h"
+
+#include "ash/common/wm_shell.h"
+#include "ash/shell.h"
+#include "ash/test/ash_test_base.h"
+#include "ash/test/shell_test_api.h"
+#include "base/memory/ptr_util.h"
+#include "ui/display/display.h"
+#include "ui/display/screen.h"
+
+namespace ash {
+namespace test {
+
+class DisplayConfigurationControllerTest : public AshTestBase {
+ public:
+  DisplayConfigurationControllerTest() {}
+  ~DisplayConfigurationControllerTest() override {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DisplayConfigurationControllerTest);
+};
+
+TEST_F(DisplayConfigurationControllerTest, ErasesAnimatorOnAnimationEnded) {
+  // TODO(wutao): needs display_configuration_controller.
+  if (WmShell::Get()->IsRunningInMash())
+    return;
+
+  display::Display display = display::Screen::GetScreen()->GetPrimaryDisplay();
+  ShellTestApi testapi(Shell::GetInstance());
+  ScreenRotationAnimator* screen_rotation_animator =
+      testapi.GetOrMakeAnimatorByDisplayId(display.id());
+  EXPECT_EQ(1, testapi.DisplayIdAnimatorMapSize());
+
+  display.set_rotation(display::Display::ROTATE_0);
+  screen_rotation_animator->Rotate(
+      display::Display::ROTATE_90,
+      display::Display::RotationSource::ROTATION_SOURCE_USER);
+  EXPECT_EQ(0, testapi.DisplayIdAnimatorMapSize());
+}
+
+}  // namespace test
+}  // namespace ash