Fix float conversion of paint timing metrics

1 files changed, 2 insertions, 1 deletions

diff --git a/components/script/dom/performance.rs b/components/script/dom/performance.rs
index 5e1f7e6fb92..3ff1d32b5d6 100644
--- a/components/script/dom/performance.rs
+++ b/components/script/dom/performance.rs
@@ -20,6 +20,7 @@ use dom::performanceobserver::PerformanceObserver as DOMPerformanceObserver;
 use dom::performancetiming::PerformanceTiming;
 use dom::window::Window;
 use dom_struct::dom_struct;
+use metrics::ToMs;
 use std::cell::Cell;
 use std::cmp::Ordering;
 use time;
@@ -260,7 +261,7 @@ impl Performance {
             Some(ref timing) => timing.navigation_start_precise(),
             None => self.navigation_start_precise,
         };
-        (time::precise_time_ns() - nav_start) as f64 / 1000000.
+        (time::precise_time_ns() - nav_start).to_ms()
     }
 }