Add a parameter that specifies whether onKeyEvent is asynchronous

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 376 matching lines @@
           {
             "type": "function",
             "name": "callback",
             "optional": true,
             "description": "Called when the operation completes",
             "parameters": []
           }
         ]
       },
       {
-        "name": "eventHandled",
-        "nodoc": true,
+        "name": "keyEventHandled",
         "type": "function",
-        "description": "Used internally to send a response for onKeyEvent.",
+        "description": "Indicates that the key event received by onKeyEvent is handled.  This should only be called if the onKeyEvent listener is asynchronous.",
         "parameters": [
-          {"type": "string", "name": "requestId"},
-          {"type": "boolean", "name": "response"}
+          {"type": "string", "name": "requestId", "description": "Request id of the event that was handled.  This should come from keyEvent.requestId"},
+          {"type": "boolean", "name": "response", "description": "True if the keystroke was handled, false if not"}
         ]
       }
     ],
     "events": [
       {
         "name": "onActivate",
         "type": "function",
         "description": "This event is sent when an IME is activated. It signals that the IME will be receiving onKeyPress events.",
         "parameters": [
           {
@@ skipping 66 matching lines @@
             "type": "string",
             "name": "engineID",
             "description": "ID of the engine receiving the event"
           },
           {
             "$ref": "KeyboardEvent",
             "name": "keyData",
             "description": "Data on the key event"
           }
         ],
+        "extraParameters": [
+          {
+            "type": "array",
+            "optional": true,
+            "name": "extraInfoSpec",
+            "description": "Array of extra information that should be passed to the listener function.",
+            "items": {
+              "type": "string",
+              "enum": ["async"]
+            }
+          }
+        ],
         "returns": {
           "type": "boolean",
-          "description": "True if the keystroke was handled, false if not"
+          "description": "True if the keystroke was handled, false if not",
+          "optional": true
         }
       },
       {
         "name": "onCandidateClicked",
         "type": "function",
         "description": "This event is sent if this extension owns the active IME.",
         "parameters": [
           {
             "type": "string",
             "name": "engineID",
@@ skipping 25 matching lines @@
           {
             "type": "string",
             "name": "name",
             "description": "Name of the MenuItem which was activated"
           }
         ]
       }
     ]
   }
 ]