MediaPerceptionPrivate API impl and testing.

chrome/test/data/extensions/api_test/media_perception_private/diagnostics/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.
+
+function getDiagnostics() {
+  chrome.mediaPerceptionPrivate.getDiagnostics(
+      chrome.test.callback(diagnosticsCallback));
+}
+

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

I'd rewrite this as

chrome.test.runTests([
  function getDiagnostics() {
    chrome.mediaPerceptionPrivate.getDiagnostics(
        chrome.test.callbackPass(function(result) {
           chrome.test.assertEq(...); 
        }));
  }
]);

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

Done.

+function diagnosticsCallback(response) {
+  chrome.test.assertEq(
+      response.perceptionSamples[0].framePerception.frameId, 1);
+}
+
+chrome.test.runTests([getDiagnostics]);
+