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.
+let statusEnum = "STARTED"

[tbarzic, 2017/04/27 20:37:35]

I'd inline these.

[Luke Sorenson, 2017/05/03 23:56:06]

Done.

+let state = { status: statusEnum }
+
+function setState() {
+  chrome.mediaPerceptionPrivate.setState(
+      state, chrome.test.callback(stateCallback));

[tbarzic, 2017/04/27 20:37:35]

chrome.test.callbackPass instead of chrome.test.callback?

[Luke Sorenson, 2017/05/03 23:56:06]

Done.

+}
+
+function stateCallback(response) {

[tbarzic, 2017/04/27 20:37:35]

can you inline this?

[Luke Sorenson, 2017/05/03 23:56:06]

Done.

+  chrome.test.assertEq(response.status, statusEnum);
+}
+
+function registerListener() {
+  chrome.mediaPerceptionPrivate.onMediaPerception.addListener(
+      function(response) {

[tbarzic, 2017/04/27 20:37:35]

You can do this as:
chrome.test.listenOnce(
    chrome.mediaPerceptionPrivate.onMediaPerceptions,
    function(evt) {
      chrome.test.assertEq(evt.timestamp, 1);
    });

[Luke Sorenson, 2017/05/03 23:56:06]

Done.

+    chrome.test.assertEq(response.timestamp, 1);
+    chrome.test.succeed();
+  });
+  chrome.test.notifyPass();
+}
+
+chrome.test.runTests([setState, registerListener]);
+