Convert everything in the Sky API from degrees to radians.

sky/tests/resources/display_list.dart

Index: sky/tests/resources/display_list.dart
diff --git a/sky/tests/resources/display_list.dart b/sky/tests/resources/display_list.dart
index 84e1c09afb9dd596cb785e2b08a7f62cd6341f29..7e22fdbabbc7e46483c4ced6711ab34cc7966263 100644
--- a/sky/tests/resources/display_list.dart
+++ b/sky/tests/resources/display_list.dart
@@ -46,8 +46,8 @@ class TestDisplayList extends RenderObjectDisplayList {
     log("scale($sx, $sy)");
   }
 
-  void rotateDegrees(double degrees) {
-    log("rotateDegrees($degrees)");
+  void rotate(double radians) {
+    log("rotate($radians)");
   }
 
   void skew(double sx, double sy) {