MediaPerceptionPrivate API impl and testing.

chrome/test/data/extensions/api_test/media_perception_private/media_perception/manifest.json

+// Copyright 2017 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.
+{

[tbarzic, 2017/05/09 01:28:36]

generate public - private key pair (e.g. I think packing the test extension in
chrome://extensions should do the job), and set "key" here - this will force a
specific extension ID for the test app, then in C++ you can add
--whitelisted-extension-id <extension-id> flag to the command line (in
SetUpCommandLine override of the test class). This will get you around the
whitelist restriction on the API in tests :)

or you can steal the key for some other private API test extension ;)

[Luke Sorenson, 2017/05/09 21:05:44]

Done.

+  "manifest_version": 2,
+  "name": "Test mediaPerceptionPrivate API's MediaPerceptionDetection event listener",
+  "version": "1.0",
+  "app": {
+    "background": {
+      "scripts": ["runtest.js"]
+    }
+  },
+  "permissions": ["mediaPerceptionPrivate"]
+}