Implement the private API for quick unlock.

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 850 matching lines @@
   }, {
     "channel": "stable",
     "extension_types": ["platform_app"],
     "whitelist": [
       "11B478CEC461C766A2DC1E5BEEB7970AE06DC9C2", // http://crbug.com/439526
       "0EFB879311E9EFBB7C45251F89EC655711B1F6ED", // http://crbug.com/439526
       "9193D3A51E2FE33B496CDA53EA330423166E7F02", // http://crbug.com/439526
       "F9119B8B18C7C82B51E7BC6FF816B694F2EC3E89"  // http://crbug.com/439526
     ]
   }],
+  "quickUnlockPrivate": [{
+    "channel": "trunk",

[Devlin, 2016/05/31 22:58:38]

Doesn't this mean that the api tests will fail on dev/beta/stable bots?

[jdufault, 2016/06/01 00:07:36]

I've changed it to stable.

+    "extension_types": ["extension"],
+    "platforms": ["chromeos"],
+    "whitelist": [
+      "E5226FF4463679C128886DF68FED2BA5E19C7835" // API test
+    ]
+  }],
   "resourcesPrivate": {
     "channel": "stable",
     "extension_types": [
       "extension", "legacy_packaged_app", "platform_app"
     ],
     "location": "component"
   },
   "rtcPrivate": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"],
@@ skipping 161 matching lines @@
     "channel": "stable",
     "extension_types": ["platform_app"],
     "platforms": ["chromeos"],
     "whitelist": [
       "A948368FC53BE437A55FEB414106E207925482F5",  // Files app
       "8C726564C6DBE7380BAB388DE6CC7EC93EB44B06",  // Video player
       "5065C83E84321221675D20FBE4DC43C655CC8C6F"   // Files app tests
     ]
   }
 }