Add code to load Hangout Services as a component extension.

chrome/common/extensions/api/_permission_features.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.
 
 // See c/c/e/features/* to understand this file, in particular feature.h,
 // simple_feature.h, and base_feature_provider.h.
 
 {
   "activeTab": {
     "channel": "stable",
@@ skipping 221 matching lines @@
     }
   ],
   "desktopCapture": [
     {
       "channel": "dev",
       "extension_types": ["extension", "platform_app"]
     },
     {
       "channel": "stable",
       "extension_types": ["extension", "platform_app"],
-      "whitelist": ["80B9DC58E5210749F052F5B4DB239C50CF72AEB6"]
+      "whitelist": [
+        "80B9DC58E5210749F052F5B4DB239C50CF72AEB6",
+        // Hangout Services component extension.
+        "nkeimhogjdpnpccoofpliimaahmaaome"
+      ]
     }
   ],
   "dns": [
     {
       "channel": "dev",
       "extension_types": ["extension", "platform_app"]
     },
     {
       "channel": "stable",
       "extension_types": ["extension", "platform_app"],
@@ skipping 532 matching lines @@
   },
   "webrtc": {
     "channel": "trunk",
     "extension_types": ["extension"]
   },
   "webrtcAudioPrivate": {
     "channel": "stable",
     "extension_types": ["extension"],
     "whitelist": [
       "80B9DC58E5210749F052F5B4DB239C50CF72AEB6",
-      "knldjmfmopnpolahpmmgbagdohdnhkik"  // Extension used for API test.
+      // Hangout Services component extension.
+      "nkeimhogjdpnpccoofpliimaahmaaome",
+      // Extension used for API test.
+      "knldjmfmopnpolahpmmgbagdohdnhkik"
     ]
   },
   "webrtcLoggingPrivate": {
     "channel": "stable",
     "extension_types": ["extension"],
-    "whitelist": ["80B9DC58E5210749F052F5B4DB239C50CF72AEB6"]
+    "whitelist": [
+      "80B9DC58E5210749F052F5B4DB239C50CF72AEB6",
+      // Hangout Services component extension.
+      "nkeimhogjdpnpccoofpliimaahmaaome"
+    ]
   },
   "webstorePrivate": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"],
     "whitelist": [
       "ahfgeienlihckogmohjhadlkjgocpleb",  // Web Store
       "afchcafgojfnemjkcbhfekplkmjaldaa",  // Enterprise Web Store
       "dofmkfphhdaddeofjngcjphcegkbbooh"   // Chrome Login Proxy (prototype)
     ]
   },
@@ skipping 13 matching lines @@
     // Only allowed for whitelisted extensions until all the caveats are
     // addressed. Tracked in crbug/285151.
     "channel": "stable",
     "extension_types": ["extension"],
     "location": "component",
     "whitelist": [
       "mfffpogegjflfpflabcdkioaeobkgjik"  // GAIA Component Extension
     ]
   }]
 }