Flip the flag to enable smooth screen rotation by default.

ash/wm/maximize_mode/maximize_mode_controller_unittest.cc

 // Copyright 2014 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/maximize_mode/maximize_mode_controller.h"
 
 #include <math.h>
 #include <utility>
 #include <vector>
 
 #include "ash/ash_switches.h"
 #include "ash/display/screen_orientation_controller_chromeos.h"
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/test/ash_test_base.h"
+#include "ash/test/display_configuration_controller_test_api.h"
 #include "ash/test/test_system_tray_delegate.h"
 #include "ash/wm/overview/window_selector_controller.h"
 #include "base/command_line.h"
 #include "base/run_loop.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "base/test/user_action_tester.h"
 #include "chromeos/accelerometer/accelerometer_reader.h"
 #include "chromeos/accelerometer/accelerometer_types.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/fake_power_manager_client.h"
@@ skipping 619 matching lines @@
   SetTabletMode(false);
   EXPECT_TRUE(IsMaximizeModeStarted());
   EXPECT_TRUE(AreEventsBlocked());
 }
 
 TEST_F(MaximizeModeControllerTest, RestoreAfterExit) {
   UpdateDisplay("1000x600");
   std::unique_ptr<aura::Window> w1(
       CreateTestWindowInShellWithBounds(gfx::Rect(10, 10, 900, 300)));
   maximize_mode_controller()->EnableMaximizeModeWindowManager(true);
+  display::Screen* screen = display::Screen::GetScreen();
+  test::DisplayConfigurationControllerTestApi display_config_controller_testapi(
+      Shell::Get()->display_configuration_controller());
+  display_config_controller_testapi.SetEnableScreenRotationAnimator(
+      screen->GetPrimaryDisplay().id(), false);
   Shell::Get()->screen_orientation_controller()->SetLockToRotation(
       display::Display::ROTATE_90);
-  display::Display display = display::Screen::GetScreen()->GetPrimaryDisplay();
+  display::Display display = screen->GetPrimaryDisplay();
   EXPECT_EQ(display::Display::ROTATE_90, display.rotation());
   EXPECT_LT(display.size().width(), display.size().height());
   maximize_mode_controller()->EnableMaximizeModeWindowManager(false);
-  display = display::Screen::GetScreen()->GetPrimaryDisplay();
+  display = screen->GetPrimaryDisplay();
   // Sanity checks.
   EXPECT_EQ(display::Display::ROTATE_0, display.rotation());
   EXPECT_GT(display.size().width(), display.size().height());
 
   // The bounds should be restored to the original bounds, and
   // should not be clamped by the portrait display in touch view.
   EXPECT_EQ(gfx::Rect(10, 10, 900, 300), w1->bounds());
+  display_config_controller_testapi.SetEnableScreenRotationAnimator(
+      screen->GetPrimaryDisplay().id(), true);
 }
 
 }  // namespace ash