Implement the private API for quick unlock.

chrome/common/extensions/api/_api_features.json

Index: chrome/common/extensions/api/_api_features.json
diff --git a/chrome/common/extensions/api/_api_features.json b/chrome/common/extensions/api/_api_features.json
index 233d2ff112de6e84900d9cf94600af7873c0256b..68e58f94be4a08d72634715a06fbdbe81ba4b336 100644
--- a/chrome/common/extensions/api/_api_features.json
+++ b/chrome/common/extensions/api/_api_features.json
@@ -699,6 +699,16 @@
     "extension_types": ["platform_app"],
     "contexts": ["blessed_extension"]
   },
+  "quickUnlockPrivate": [{
+    "dependencies": ["permission:quickUnlockPrivate"],
+    "contexts": ["blessed_extension"]

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

which extension is using this?

[jdufault, 2016/06/01 00:07:35]

The test extension, and possibly an app launched by options.

[Devlin, 2016/06/01 17:44:12]

If we move this to a unittest, we should be able to remove the entry, which
would be nice IMO.

+  }, {
+    "channel": "trunk",
+    "contexts": ["webui"],
+    "matches": [
+      "chrome://md-settings/*"
+    ]
+  }],
   "resourcesPrivate": [{
     "dependencies": ["permission:resourcesPrivate"],
     "contexts": ["blessed_extension"]