Introduce networking.cast API

extensions/common/api/_api_features.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.
 
 // This features file defines extension APIs implemented under src/extensions.
 // See chrome/common/extensions/api/_features.md to understand this file, as
 // well as feature.h, simple_feature.h, and feature_provider.h.
 //
 // Note that specifying "web_page", "blessed_web_page", or "all" as a context
 // type will require manually updating chrome/renderer/resources/dispatcher.cc.
@@ skipping 278 matching lines @@
   },
   "mojoPrivate": {
     "contexts": ["blessed_extension"],
     "channel": "stable",
     "extension_types": ["platform_app", "extension"],
     "whitelist": [
       "63ED55E43214C211F82122ED56407FF1A807F2A3",   // Media Router Dev
       "226CF815E39A363090A1E547D53063472B8279FA"    // Media Router Stable
     ]
   },
+  "networking.cast": {
+    "channel": "stable",
+    "contexts": ["blessed_extension"],
+    "dependencies": ["permission:networking.cast"]
+  },
   "networking.config": {
     "dependencies": ["permission:networking.config"],
     "contexts": ["blessed_extension"]
   },
   "networking.onc": {
     "dependencies": ["permission:networking.onc"],
     "contexts": ["blessed_extension"],
     "source": "networkingPrivate"
   },
   "networkingPrivate": [{
@@ skipping 224 matching lines @@
   }, {
     "channel": "stable",
     "contexts": ["webui"],
     "matches": [
       "chrome://chrome-signin/*",
       "chrome://media-router/*",
       "chrome://oobe/*"
     ]
   }]
 }