Flip the flag to enable smooth screen rotation by default.

ash/wm/maximize_mode/maximize_mode_controller_unittest.cc

Index: ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
diff --git a/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc b/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
index cf6bb66e3fb045e9b2b0105506574dd5b3937240..7ebe287b6ec88a3b94b5364763bbf294b71eaf98 100644
--- a/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
+++ b/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
@@ -13,6 +13,7 @@
 #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"
@@ -652,13 +653,18 @@ TEST_F(MaximizeModeControllerTest, RestoreAfterExit) {
   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());
@@ -666,6 +672,8 @@ TEST_F(MaximizeModeControllerTest, RestoreAfterExit) {
   // 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