Implementation of the DeviceInfo get API.

chrome/common/extensions/api/_api_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.
 
 {
   "activityLogPrivate": {
     "dependencies": ["permission:activityLogPrivate"],
@@ skipping 447 matching lines @@
     "contexts": ["blessed_extension"]
   },
   "serial": {
     "dependencies": ["permission:serial"],
     "contexts": ["blessed_extension"]
   },
   "sessionRestore": {
     "dependencies": ["permission:sessionRestore"],
     "contexts": ["blessed_extension"]
   },
+  "signedInDevices": {
+    "dependencies": ["permission:signedInDevices"],
+    "contexts": ["blessed_extension"]
+  }.
   "socket": {
     "dependencies": ["permission:socket"],
     "contexts": ["blessed_extension"]
   },
   "storage": {
     "dependencies": ["permission:storage"],
     "contexts": ["blessed_extension", "unblessed_extension", "content_script"]
   },
   "streamsPrivate": {
     "dependencies": ["permission:streamsPrivate"],
@@ skipping 119 matching lines @@
   },
   "webview": {
     "dependencies": ["permission:webview"],
     "contexts": ["blessed_extension"]
   },
   "windows": {
     "dependencies": ["permission:tabs"],
     "contexts": ["blessed_extension"]
   }
 }