1 files changed, 88 insertions, 0 deletions
diff --git a/gfx/layers/apz/test/mochitest/browser_test_content_response_timeout.js b/gfx/layers/apz/test/mochitest/browser_test_content_response_timeout.js
new file mode 100644
index 0000000000..a80fd77c17
--- /dev/null
+++ b/gfx/layers/apz/test/mochitest/browser_test_content_response_timeout.js
@@ -0,0 +1,88 @@
+/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set sts=2 sw=2 et tw=80: */
+
+"use strict";
+
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/gfx/layers/apz/test/mochitest/apz_test_utils.js",
+  this
+);
+
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/gfx/layers/apz/test/mochitest/apz_test_native_event_utils.js",
+  this
+);
+
+add_task(async () => {
+  // Use pan gesture events for Mac.
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      // Set a relatively shorter timeout value.
+      ["apz.content_response_timeout", 100],
+    ],
+  });
+
+  const URL_ROOT = getRootDirectory(gTestPath).replace(
+    "chrome://mochitests/content/",
+    "http://mochi.test:8888/"
+  );
+  // Load a content having an APZ-aware listener causing 500ms busy state and
+  // a scroll event listener changing the background color of an element.
+  // The reason why we change the background color in a scroll listener rather
+  // than setting up a Promise resolved in a scroll event handler and waiting
+  // for the Promise is SpecialPowers.spawn doesn't allow it (bug 1743857).
+  const tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    URL_ROOT + "helper_content_response_timeout.html"
+  );
+
+  let scrollPromise = BrowserTestUtils.waitForContentEvent(
+    tab.linkedBrowser,
+    "scroll"
+  );
+
+  await SpecialPowers.spawn(tab.linkedBrowser, [], async () => {
+    await content.wrappedJSObject.promiseApzFlushedRepaints();
+    await content.wrappedJSObject.waitUntilApzStable();
+  });
+
+  // Note that below function uses `WaitForObserver` version of sending a
+  // pan-start event function so that the notification can be sent in the parent
+  // process, thus we can get the notification even if the content process is
+  // busy.
+  await NativePanHandler.promiseNativePanEvent(
+    tab.linkedBrowser,
+    100,
+    100,
+    0,
+    NativePanHandler.delta,
+    NativePanHandler.beginPhase
+  );
+
+  await new Promise(resolve => {
+    setTimeout(resolve, 200);
+  });
+
+  await NativePanHandler.promiseNativePanEvent(
+    tab.linkedBrowser,
+    100,
+    100,
+    0,
+    NativePanHandler.delta,
+    NativePanHandler.updatePhase
+  );
+  await NativePanHandler.promiseNativePanEvent(
+    tab.linkedBrowser,
+    100,
+    100,
+    0,
+    0,
+    NativePanHandler.endPhase
+  );
+
+  await scrollPromise;
+  ok(true, "We got at least one scroll event");
+
+  BrowserTestUtils.removeTab(tab);
+  await SpecialPowers.popPrefEnv();
+});