[CSS Typed OM] Make CSSRotation attributes mutable.

third_party/WebKit/Source/core/css/cssom/CSSRotation.idl

Index: third_party/WebKit/Source/core/css/cssom/CSSRotation.idl
diff --git a/third_party/WebKit/Source/core/css/cssom/CSSRotation.idl b/third_party/WebKit/Source/core/css/cssom/CSSRotation.idl
index 16f26f054c22d7d6c71043510da51b0f1f5d9f86..c4018ed47b8ea1f46fee3a5082f4438914921057 100644
--- a/third_party/WebKit/Source/core/css/cssom/CSSRotation.idl
+++ b/third_party/WebKit/Source/core/css/cssom/CSSRotation.idl
@@ -12,8 +12,8 @@
     RuntimeEnabled=CSSTypedOM,
     RaisesException=Constructor
 ] interface CSSRotation : CSSTransformComponent {
-    readonly attribute CSSNumericValue angle;
-    readonly attribute double x;
-    readonly attribute double y;
-    readonly attribute double z;
+    [RaisesException=Setter] attribute CSSNumericValue angle;
+    attribute double x;
+    attribute double y;
+    attribute double z;
 };