Plumb listenerIDs correctly for events that clobber chrome.Event.prototype.dispatch.

chrome/common/extensions/api/input_ime.json

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 [
   {
     "namespace": "input.ime",
     "platforms": ["chromeos"],
     "types": [
       {
@@ skipping 451 matching lines @@
             "type": "InputContext",
             "name": "context",
             "description": "An InputContext object describing the text field that has changed."
           }
         ]
       },
       {
         "name": "onKeyEvent",
         "type": "function",
         "description": "This event is sent if this extension owns the active IME.",
+        "options": {
+          "supportsFilters": false,
+          "supportsListeners": true,
+          "supportsRules": false,
+          "maxListeners": 1
+        },
         "parameters": [
           {
             "type": "string",
             "name": "engineID",
             "description": "ID of the engine receiving the event"
           },
           {
             "type": "KeyboardEvent",
             "name": "keyData",
             "description": "Data on the key event"
@@ skipping 40 matching lines @@
           {
             "type": "string",
             "name": "name",
             "description": "Name of the MenuItem which was activated"
           }
         ]
       }
     ]
   }
 ]