Devtools Animations: Update transition timing on timeline interaction

Source/devtools/front_end/elements/AnimationTimeline.js

Index: Source/devtools/front_end/elements/AnimationTimeline.js
diff --git a/Source/devtools/front_end/elements/AnimationTimeline.js b/Source/devtools/front_end/elements/AnimationTimeline.js
index b8c496a74ba361ade64c588bb80aea30271c2c08..9506e01a9eb05dd0b2f5c98d9ec159702898ebd4 100644
--- a/Source/devtools/front_end/elements/AnimationTimeline.js
+++ b/Source/devtools/front_end/elements/AnimationTimeline.js
@@ -786,11 +786,10 @@ WebInspector.AnimationUI.prototype = {
             var duration = this._duration();
             this._setDelay(delay);
             this._setDuration(duration);
-            // FIXME: Transition timing updates currently not supported
-            if (this._animation.type() == "WebAnimation") {
+            if (this._animation.type() !== "CSSAnimation") {
                 var target = WebInspector.targetManager.mainTarget();
                 if (target)
-                    target.animationAgent().setTiming(this._animation.id(), duration, delay);
+                    target.animationAgent().setTiming(this._animation.id(), duration, delay, this._animation.type() === "CSSTransition");
             }
         }