Add chrome.virtualKeyboardPrivate.openSettings api to open settings page

chrome/common/extensions/api/virtual_keyboard_private.json

 // Copyright 2013 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": "virtualKeyboardPrivate",
     "compiler_options": {
       "implemented_in": "chrome/browser/extensions/api/input/input.h"
     },
@@ skipping 131 matching lines @@
                   },
                   "experimental": {
                     "type": "boolean",
                     "description": "True if experimental features are enabled."
                   }
                 }
               }
             ]
           }
         ]
+      },
+      {
+        "name": "openSettings",
+        "type": "function",
+        "description": "Opens chrome://settings/languages page.",
+        "parameters": [
+        ]
       }
     ],
     "events": [
       {
         "name": "onTextInputBoxFocused",
         "type": "function",
         "description": "This event is sent when focus enters a text input box.",
         "parameters": [
           {
             "type": "object",
             "name": "context",
             "description": "Describes the text input box that has acquired focus. Note only the type of text input box is passed. This API is intended to be used by non-ime virtual keyboard only. Normal ime virtual keyboard should use chrome.input.ime.onFocus to get the more detailed InputContext.",
             "properties": {
               "type": {
                 "type": "string",
                 "description": "The value of type attribute of the focused text input box.",
                 "enum": ["text", "number", "password", "date", "url", "tel", "email"]
               }
             }
           }
         ]
       }
     ]
   }
 ]