Add easyUnlockPrivate extension API

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.
 
 // This features file defines permissions for extension APIs implemented
 // under src/chrome.
 // See extensions/common/features/* to understand this file, in particular
 // feature.h, simple_feature.h, and base_feature_provider.h.
 
 // To add a new whitelisted ID, SHA-1 it and force it to uppercase. In Bash:
@@ skipping 376 matching lines @@
     "channel": "stable",
     "extension_types": ["extension"],
     "whitelist": [
       "63ED55E43214C211F82122ED56407FF1A807F2A3",  // Dev
       "FA01E0B81978950F2BC5A50512FD769725F57510",  // Beta
       "B11A93E7E5B541F8010245EBDE2C74647D6C14B9",  // Canary
       "F155646B5D1CA545F7E1E4E20D573DFDD44C2540",  // Google Cast Beta
       "16CA7A47AAE4BE49B1E75A6B960C3875E945B264"   // Google Cast Stable
     ]
   },
+  "easyUnlockPrivate": {
+    "channel": "stable",
+    "extension_types": ["platform_app"],
+    "location": "component"
+  },
   "enterprise.platformKeys": {
     "channel": "stable",
     "platforms": ["chromeos"],
     "extension_types": ["extension", "legacy_packaged_app"],
     "location": "policy"
   },
   "enterprise.platformKeysPrivate": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"],
     "platforms": ["chromeos"],
@@ skipping 681 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": [
       "D519188F86D9ACCEE0412007B227D9936EB9676B"  // GAIA Component Extension
     ]
   }]
 }