Devtools Animations: Represent delay and end-delay on the animation timeline

Source/devtools/protocol.json

 {
     "version": { "major": "1", "minor": "1" },
     "domains": [{
         "domain": "Inspector",
         "hidden": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications."
@@ skipping 4733 matching lines @@
                     { "name": "type", "type": "string", "enum": ["CSSTransition", "CSSAnimation", "WebAnimation"], "description": "Animation type of <code>AnimationPlayer</code>." }
                 ],
                 "description": "AnimationPlayer instance."
             },
             {
                 "id": "AnimationNode",
                 "type": "object",
                 "hidden": true,
                 "properties": [
                     { "name": "delay", "type": "number", "description": "<code>AnimationNode</code>'s delay." },
+                    { "name": "endDelay", "type": "number", "description": "<code>AnimationNode</code>'s end delay." },
                     { "name": "playbackRate", "type": "number", "description": "<code>AnimationNode</code>'s playbackRate." },
                     { "name": "iterationStart", "type": "number", "description": "<code>AnimationNode</code>'s iteration start." },
                     { "name": "iterations", "type": "number", "description": "<code>AnimationNode</code>'s iterations." },
                     { "name": "duration", "type": "number", "description": "<code>AnimationNode</code>'s iteration duration." },
                     { "name": "direction", "type": "string", "description": "<code>AnimationNode</code>'s playback direction." },
                     { "name": "fill", "type": "string", "description": "<code>AnimationNode</code>'s fill mode." },
                     { "name": "name", "type": "string", "description": "<code>AnimationNode</code>'s name." },
                     { "name": "backendNodeId", "$ref": "DOM.BackendNodeId", "description": "<code>AnimationNode</code>'s target node." },
                     { "name": "keyframesRule", "$ref": "KeyframesRule", "optional": true, "description": "<code>AnimationNode</code>'s keyframes." },
                     { "name": "easing", "type": "string", "description": "<code>AnimationNode</code>'s timing function." }
@@ skipping 106 matching lines @@
                 ],
                 "returns": [
                     { "name": "accessibilityNode", "$ref": "AXNode", "description": "The <code>Accessibility.AXNode</code> for this DOM node, if it exists.", "optional": true }
                 ],
                 "description": "Fetches the accessibility node for this DOM node, if it exists.",
                 "hidden": true
             }
         ]
     }]
 }