[Extensions] Implement chrome.runtime.openOptionsPage.

extensions/common/api/runtime.json

 // Copyright 2014 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.
 
 // Note: Many of these functions and events are implemented by hand and should
 // not elicit any code generation from the schema compiler. These items are
 // marked "nocompile."
 [
   {
     "namespace": "runtime",
@@ skipping 91 matching lines @@
                 "type": "object",
                 "isInstanceOf": "Window",
                 "additionalProperties": { "type": "any" },
                 "description": "The JavaScript 'window' object for the background page."
               }
             ]
           }
         ]
       },
       {
+        "name": "openOptionsPage",
+        "type": "function",
+        "description": "<p>Open your Extension's options page, if possible.</p><p>The precise behavior may depend on your manifest's <code><a href=\"optionsV2\">options_ui</a></code> or <code><a href=\"options\">options_page</a></code> key, or what Chrome happens to support at the time. For example, the page may be opened in a new tab, within chrome://extensions, within an App, or it may just focus an open options page. It will never cause the caller page to reload.</p><p>If your Extension does not declare an options page, or Chrome failed to create one for some other reason, the callback will set $(ref:lastError).</p>",
+        "parameters": [{
+          "type": "function",
+          "name": "callback",
+          "parameters": [],
+          "optional": true
+        }]
+      },
+      {
         "name": "getManifest",
         "description": "Returns details about the app or extension from the manifest. The object returned is a serialization of the full <a href=\"manifest.html\">manifest file</a>.",
         "type": "function",
         "nocompile": true,
         "parameters": [],
         "returns": {
           "type": "object",
           "properties": {},
           "additionalProperties": { "type": "any" },
           "description": "The manifest details."
@@ skipping 352 matching lines @@
             "type": "string",
             "name": "reason",
             "description": "The reason that the event is being dispatched. 'app_update' is used when the restart is needed because the application is updated to a newer version. 'os_update' is used when the restart is needed because the browser/OS is updated to a newer version. 'periodic' is used when the system runs for more than the permitted uptime set in the enterprise policy.",
             "enum": ["app_update", "os_update", "periodic"]
           }
         ]
       }
     ]
   }
 ]