DBus MediaAnalyticsClient and media_perception pb.

chrome/test/data/extensions/api_test/media_perception_private/media_perception/runtest.js

+// 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.
+
+// Set the state to STARTED to automatically start listening to
+// MediaPerceptionDetection signals.
+
+function setState() {
+  let kStatusEnum = "STARTED";
+  chrome.mediaPerceptionPrivate.setState(
+     { status: statusEnum }, chrome.test.callbackPass(
+         function (response) {
+           chrome.test.assertEq(response.status, statusEnum);
+     }));
+}
+
+function registerListener() {
+  chrome.test.listenOnce(
+      chrome.mediaPerceptionPrivate.onMediaPerception,
+      function(evt) {
+        chrome.test.assertEq(evt.timestamp, 1);
+    });
+  chrome.test.notifyPass();

[tbarzic, 2017/05/05 21:10:41]

you should not need this.

[Luke Sorenson, 2017/05/08 19:06:06]

Done. In https://codereview.chromium.org/2858353002/

+}
+
+chrome.test.runTests([setState, registerListener]);
+