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 707610cc71299640ab43b1a8c6948d33d5605623..fa9c473dc3eb563bfc39b064c09a2cd2ff36905e 100644
--- a/Source/devtools/front_end/elements/AnimationTimeline.js
+++ b/Source/devtools/front_end/elements/AnimationTimeline.js
@@ -790,11 +790,10 @@ 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");
             }
         }