Handles users rotating screen too early

ash/display/display_configuration_controller_unittest.cc

Index: ash/display/display_configuration_controller_unittest.cc
diff --git a/ash/display/display_configuration_controller_unittest.cc b/ash/display/display_configuration_controller_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..652b2661177438a3d1a7fc777dc54dc4e3785fa4
--- /dev/null
+++ b/ash/display/display_configuration_controller_unittest.cc
@@ -0,0 +1,46 @@
+// 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/common/wm_shell.h"
+#include "ash/rotator/screen_rotation_animator.h"
+#include "ash/shell.h"
+#include "ash/test/ash_test_base.h"
+#include "ash/test/display_configuration_controller_test_api.h"
+#include "base/macros.h"
+#include "ui/display/manager/display_manager.h"
+
+namespace ash {
+
+class DisplayConfigurationControllerTest : public test::AshTestBase {
+ public:
+  DisplayConfigurationControllerTest() {}
+  ~DisplayConfigurationControllerTest() override {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DisplayConfigurationControllerTest);
+};
+
+TEST_F(DisplayConfigurationControllerTest, ErasesAnimatorOnAnimationEnded) {
+  // TODO(wutao): needs display_configuration_controller
+  // http://crbug.com/686839.
+  if (WmShell::Get()->IsRunningInMash())
+    return;
+
+  display::Display display = display::Screen::GetScreen()->GetPrimaryDisplay();
+  test::DisplayConfigurationControllerTestApi testapi(
+      Shell::GetInstance()->display_configuration_controller());
+  ScreenRotationAnimator* screen_rotation_animator =
+      testapi.GetScreenRotationAnimatorForDisplay(display.id());
+  EXPECT_EQ(1, testapi.DisplayScreenRotationAnimatorMapSize());
+
+  Shell::GetInstance()->display_manager()->SetDisplayRotation(
+      display.id(), display::Display::ROTATE_0,
+      display::Display::RotationSource::ROTATION_SOURCE_USER);
+  screen_rotation_animator->Rotate(
+      display::Display::ROTATE_90,
+      display::Display::RotationSource::ROTATION_SOURCE_USER);
+  EXPECT_EQ(0, testapi.DisplayScreenRotationAnimatorMapSize());
+}
+
+}  // namespace ash