exo: Rotate cursor snapshot for rotated displays

ui/display/display.cc

Index: ui/display/display.cc
diff --git a/ui/display/display.cc b/ui/display/display.cc
index 25573f8f9b90e3408ab9234162a0a9b0c92aae70..3255fbf3555cf8061bfe79402e274d5d084a0b6d 100644
--- a/ui/display/display.cc
+++ b/ui/display/display.cc
@@ -115,18 +115,7 @@ Display::Display(const Display& other) = default;
 Display::~Display() {}
 
 int Display::RotationAsDegree() const {
-  switch (rotation_) {
-    case ROTATE_0:
-      return 0;
-    case ROTATE_90:
-      return 90;
-    case ROTATE_180:
-      return 180;
-    case ROTATE_270:
-      return 270;
-  }
-  NOTREACHED();
-  return 0;
+  return RotateToDegree(rotation_);
 }
 
 void Display::SetRotationAsDegree(int rotation) {
@@ -231,4 +220,20 @@ bool Display::HasInternalDisplay() {
   return internal_display_id_ != kInvalidDisplayId;
 }
 
+// static
+int Display::RotateToDegree(Rotation rotation) {
+  switch (rotation) {
+    case ROTATE_0:
+      return 0;
+    case ROTATE_90:
+      return 90;
+    case ROTATE_180:
+      return 180;
+    case ROTATE_270:
+      return 270;
+  }
+  NOTREACHED();
+  return 0;
+}
+
 }  // namespace display