Add second copy request after screen rotation to flatten the layers in animation.

chrome/browser/flag_descriptions.cc

Index: chrome/browser/flag_descriptions.cc
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index 9ff4142425f93087a2d5f6b5ea50dbc7a5becd07..246db1470d956b3028d40eb7d55405135c637bfc 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -722,6 +722,12 @@ const char kAshEnableMirroredScreenDescription[] =
     "Enable the mirrored screen mode. This mode flips the screen image "
     "horizontally.";
 
+const char kAshEnableSmoothScreenRotationName[] =
+    "Enalbe smoother screen rotation.";
+
+const char kAshEnableSmoothScreenRotationDescription[] =
+    "Enalbe smoother screen rotation.";
+
 const char kMaterialDesignInkDropAnimationFast[] = "Fast";
 
 const char kMaterialDesignInkDropAnimationSlow[] = "Slow";