Flip the flag to enable smooth screen rotation by default.

ash/ash_switches.h

Index: ash/ash_switches.h
diff --git a/ash/ash_switches.h b/ash/ash_switches.h
index c8846d8817f3bdca1ddaed65259504e8141dcdda..275e5b941ab6825be43665abd2fea43c1cbae50d 100644
--- a/ash/ash_switches.h
+++ b/ash/ash_switches.h
@@ -23,12 +23,12 @@ ASH_EXPORT extern const char kAshDebugShortcuts[];
 ASH_EXPORT extern const char kAshDeveloperShortcuts[];
 ASH_EXPORT extern const char kAshDisableMaximizeModeWindowBackdrop[];
 ASH_EXPORT extern const char kAshDisableScreenOrientationLock[];
+ASH_EXPORT extern const char kAshDisableSmoothScreenRotation[];
 ASH_EXPORT extern const char kAshDisableTouchExplorationMode[];
 ASH_EXPORT extern const char kAshEnableMagnifierKeyScroller[];
 ASH_EXPORT extern const char kAshEnablePaletteOnAllDisplays[];
 ASH_EXPORT extern const char kAshEnableTouchView[];
 ASH_EXPORT extern const char kAshEnableMirroredScreen[];
-ASH_EXPORT extern const char kAshEnableSmoothScreenRotation[];
 ASH_EXPORT extern const char kAshEstimatedPresentationDelay[];
 ASH_EXPORT extern const char kAshForceEnablePalette[];
 ASH_EXPORT extern const char kAshForceTabletMode[];