servo: Merge #5872 - Fix CanvasGradient.addColorStop() (from nox:canvasgradient); r=saneyuki

The argument should be a double.

Source-Repo: https://github.com/servo/servo
Source-Revision: eefa3eba256d48bc24189417c3bb8d3a9a77d979

servo/components/script/dom/canvasgradient.rs

@@ -44,7 +44,7 @@ impl CanvasGradient {
 
 impl<'a> CanvasGradientMethods for JSRef<'a, CanvasGradient> {
     // https://html.spec.whatwg.org/multipage/#dom-canvasgradient-addcolorstop
-    fn AddColorStop(self, offset: Finite<f32>, color: String) {
+    fn AddColorStop(self, offset: Finite<f64>, color: String) {
         let default_black = RGBA {
             red: 0.0,
             green: 0.0,

servo/components/script/dom/webidls/CanvasGradient.webidl

@@ -3,10 +3,11 @@
  * 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/. */
 
+// https://html.spec.whatwg.org/#canvasgradient
+// [Exposed=(Window,Worker)]
 interface CanvasGradient {
   // opaque object
-  // addColorStop should take a double
-  void addColorStop(float offset, DOMString color);
+  void addColorStop(double offset, DOMString color);
 };