Bug 1332633 - Add Servo_AnimationValues_ComputeDistance. r=emilio

This FFI will be used by nsDOMWindowUtils::ComputeAnimationDistance,
which will be implemented in another bug.

MozReview-Commit-ID: G3aYICDnCLA

--HG--
extra : rebase_source : 6bb2a8452f7d954da7dcc1da0818e125b5cb17bc

layout/style/ServoBindingList.h

@@ -163,6 +163,9 @@ SERVO_BINDING_FUNC(Servo_AnimationValues_Interpolate,
 SERVO_BINDING_FUNC(Servo_AnimationValues_IsInterpolable, bool,
                    RawServoAnimationValueBorrowed from,
                    RawServoAnimationValueBorrowed to)
+SERVO_BINDING_FUNC(Servo_AnimationValues_ComputeDistance, double,
+                   RawServoAnimationValueBorrowed from,
+                   RawServoAnimationValueBorrowed to)
 SERVO_BINDING_FUNC(Servo_AnimationValue_Serialize, void,
                    RawServoAnimationValueBorrowed value,
                    nsCSSPropertyID property,