Modify devtools to show passive event listeners.

third_party/WebKit/Source/devtools/protocol.json

 {
     "version": { "major": "1", "minor": "1" },
     "domains": [{
         "domain": "Inspector",
         "hidden": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications.",
@@ skipping 3768 matching lines @@
                 "enum": ["subtree-modified", "attribute-modified", "node-removed"],
                 "description": "DOM breakpoint type."
             },
             {
                 "id": "EventListener",
                 "type": "object",
                 "description": "Object event listener.",
                 "properties": [
                     { "name": "type", "type": "string", "description": "<code>EventListener</code>'s type." },
                     { "name": "useCapture", "type": "boolean", "description": "<code>EventListener</code>'s useCapture." },
+                    { "name": "passive", "type": "boolean", "description": "<code>EventListener</code>'s passive flag." },
                     { "name": "location", "$ref": "Debugger.Location", "description": "Handler code location." },
                     { "name": "handler", "$ref": "Runtime.RemoteObject", "optional": true, "description": "Event handler function value." },
                     { "name": "originalHandler", "$ref": "Runtime.RemoteObject", "optional": true, "description": "Event original handler function value." }
                 ],
                 "hidden": true
             }
         ],
         "commands": [
             {
                 "name": "setDOMBreakpoint",
@@ skipping 1267 matching lines @@
                 ],
                 "returns": [
                     { "name": "accessibilityNode", "$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
             }
         ]
     }]
 }