Add Performance object to Window and implement Performance::Now()

src/components/script/dom/performance.rs

@@ -0,0 +1,59 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * 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::codegen::BindingDeclarations::PerformanceBinding;
+use dom::bindings::js::{JS, JSRef, Temporary};
+use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
+use dom::performancetiming::{PerformanceTiming, PerformanceTimingMethods};
+use dom::window::Window;
+
+use time;
+
+pub type DOMHighResTimeStamp = f64;
+
+#[deriving(Encodable)]
+pub struct Performance {
+    pub reflector_: Reflector,
+    pub timing: JS<PerformanceTiming>,
+}
+
+impl Performance {
+    fn new_inherited(window: &JSRef<Window>) -> Performance {
+        Performance {
+            reflector_: Reflector::new(),
+            timing: PerformanceTiming::new(window).root().root_ref().unrooted(),
+        }
+    }
+
+    pub fn new(window: &JSRef<Window>) -> Temporary<Performance> {
+        let performance = Performance::new_inherited(window);
+        reflect_dom_object(~performance, window, PerformanceBinding::Wrap)
+    }
+}
+
+pub trait PerformanceMethods {
+    fn Timing(&self) -> Temporary<PerformanceTiming>;
+    fn Now(&self) -> DOMHighResTimeStamp;
+}
+
+impl<'a> PerformanceMethods for JSRef<'a, Performance> {
+    fn Timing(&self) -> Temporary<PerformanceTiming> {
+        Temporary::new(self.timing.clone())
+    }
+
+    fn Now(&self) -> DOMHighResTimeStamp {
+        let navStart = self.timing.root().NavigationStartPrecise() as f64;
+        (time::precise_time_s() - navStart) as DOMHighResTimeStamp
+    }
+}
+
+impl Reflectable for Performance {
+    fn reflector<'a>(&'a self) -> &'a Reflector {
+        &self.reflector_
+    }
+
+    fn mut_reflector<'a>(&'a mut self) -> &'a mut Reflector {
+        &mut self.reflector_
+    }
+}