import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/media/test/test_background_video_suspend.html

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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Test Background Video Suspends</title>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="manifest.js"></script>
+<script src="background_video.js"></script>
+<link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
+<script type="text/javascript">
+"use strict";
+
+var manager = new MediaTestManager;
+
+var MIN_DELAY = 100;
+
+function testDelay(v, start, min) {
+  let end = performance.now();
+  let delay = end - start;
+  ok(delay > min, `${v.token} suspended with a delay of ${delay} ms`);
+}
+
+startTest({
+  desc: 'Test Background Video Suspends',
+  prefs: [
+    [ "media.test.setVisible", true ],
+    [ "media.suspend-bkgnd-video.enabled", true ],
+    // User a short delay to ensure video decode suspend happens before end
+    // of video.
+    [ "media.suspend-bkgnd-video.delay-ms", MIN_DELAY ]
+  ],
+  tests: gDecodeSuspendTests,
+  runTest: (test, token) => {
+    let v = appendVideoToDoc(test.name, token);
+    manager.started(token);
+
+    let start;
+    waitUntilPlaying(v)
+      .then(() => { start = performance.now(); })
+      .then(() => testVideoSuspendsWhenHidden(v))
+      .then(() => {
+        testDelay(v, start, MIN_DELAY);
+        return testVideoResumesWhenShown(v);
+      })
+      .then(() => waitUntilEnded(v))
+      .then(() => {
+        removeNodeAndSource(v);
+        manager.finished(token);
+      });
+  }
+});
+</script>