MediaPerceptionPrivate API impl and testing.

extensions/test/data/media_perception_private/diagnostics/manifest.json

Index: extensions/test/data/media_perception_private/diagnostics/manifest.json
diff --git a/extensions/test/data/media_perception_private/diagnostics/manifest.json b/extensions/test/data/media_perception_private/diagnostics/manifest.json
new file mode 100644
index 0000000000000000000000000000000000000000..f30f4cce9a68427c7b6cb53c40e90abdf212fbc3
--- /dev/null
+++ b/extensions/test/data/media_perception_private/diagnostics/manifest.json
@@ -0,0 +1,16 @@
+// 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.
+{
+  "key": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC74Vbx3EbhPc/FOvn6+HxCjMSml0HdPMiuRjj5a3b+MnRML1iJ9OAgbKUYJ/u3s25/cGq8pNB0NbyupHGEqvqAE7TcNr1mdgs0PWxh2IOI1GKrxlzxpqzQuFmxq5WHKr5RrwZ4/Xq0t/+e8JkvhZdW0jarz/28Jom0gkM5lorsewIDAQAB",
+  "manifest_version": 2,
+  "name": "Test mediaPerceptionPrivate API's getDiagnostics function.",
+  "version": "1.0",
+  "app": {
+    "background": {
+      "scripts": ["runtest.js"]
+    }
+  },
+  "permissions": ["mediaPerceptionPrivate"],
+  "kiosk_enabled": true
+}