Flip the flag to enable smooth screen rotation by default.

ash/ash_switches.cc

Index: ash/ash_switches.cc
diff --git a/ash/ash_switches.cc b/ash/ash_switches.cc
index 9f30a0e616a2752e32bd63026c84bc096204bf41..4ec343dd53900dd6f628512c2afcbe356cb1f4cd 100644
--- a/ash/ash_switches.cc
+++ b/ash/ash_switches.cc
@@ -58,9 +58,9 @@ const char kAshEnableTouchView[] = "enable-touchview";
 // Enables mirrored screen.
 const char kAshEnableMirroredScreen[] = "ash-enable-mirrored-screen";
 
-// Enables a smoother animation for screen rotation.
-const char kAshEnableSmoothScreenRotation[] =
-    "ash-enable-smooth-screen-rotation";
+// Disables a smoother animation for screen rotation.
+const char kAshDisableSmoothScreenRotation[] =
+    "ash-disable-smooth-screen-rotation";
 
 // Specifies the estimated time (in milliseconds) from VSYNC event until when
 // visible light can be noticed by the user.