Add <extensionview>

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 extensions/common/features/* to understand this file, in particular
 // feature.h, simple_feature.h, and base_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 108 matching lines @@
     "contexts": ["blessed_extension"]
   },
   // This is not a real API, only here for documentation purposes.
   // See http://crbug.com/275944 for background.
   "extensionTypes": {
     "internal": true,
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app", "platform_app"],
     "contexts": ["blessed_extension"]
   },
+  "extensionViewInternal": {
+    "internal": true,
+    "contexts": ["blessed_extension"],
+    "dependencies": ["permission:extensionview"]
+  },
   "events": {
     "internal": true,
     "channel": "stable",
     "extension_types": ["platform_app", "extension"],
     "contexts": "all",
     "matches": ["<all_urls>"]
   },
   "guestViewInternal": [
     {
       "internal": true,
@@ skipping 284 matching lines @@
   }],
   "webViewRequest": [{
     "dependencies": ["permission:webview"],
     "contexts": ["blessed_extension"]
   }, {
     "channel": "stable",
     "contexts": ["webui"],
     "matches": ["chrome://chrome-signin/*", "chrome://oobe/*"]
   }]
 }