Introduce GlobalScope::crypto

components/script/dom/globalscope.rs

@@ -2,19 +2,23 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+use dom::bindings::js::{JS, MutNullableHeap, Root};
 use dom::bindings::reflector::Reflectable;
+use dom::crypto::Crypto;
 use dom::eventtarget::EventTarget;
 use js::jsapi::{JS_GetContext, JS_GetObjectRuntime, JSContext};
 
 #[dom_struct]
 pub struct GlobalScope {
     eventtarget: EventTarget,
+    crypto: MutNullableHeap<JS<Crypto>>,
 }
 
 impl GlobalScope {
     pub fn new_inherited() -> GlobalScope {
         GlobalScope {
             eventtarget: EventTarget::new_inherited(),
+            crypto: Default::default(),
         }
     }
 
@@ -29,4 +33,8 @@ impl GlobalScope {
             context
         }
     }
+
+    pub fn crypto(&self) -> Root<Crypto> {
+        self.crypto.or_init(|| Crypto::new(self))
+    }
 }