1 files changed, 128 insertions, 0 deletions
diff --git a/gfx/layers/apz/test/mochitest/browser_test_scrolling_in_extension_popup_window.js b/gfx/layers/apz/test/mochitest/browser_test_scrolling_in_extension_popup_window.js
new file mode 100644
index 0000000000..6da3f3311b
--- /dev/null
+++ b/gfx/layers/apz/test/mochitest/browser_test_scrolling_in_extension_popup_window.js
@@ -0,0 +1,128 @@
+/* -*- 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/browser/components/extensions/test/browser/head.js",
+  this
+);
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/browser/components/extensions/test/browser/head_browserAction.js",
+  this
+);
+
+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 () => {
+  let extension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      browser_action: {
+        default_popup: "popup.html",
+        browser_style: true,
+      },
+    },
+
+    files: {
+      "popup.html": `
+        <html>
+          <head>
+            <meta charset="utf-8">
+            <style>
+              * {
+                padding: 0;
+                margin: 0;
+              }
+              body {
+                height: 400px;
+                width: 200px;
+                overflow-y: auto;
+                overflow-x: hidden;
+              }
+              li {
+                display: flex;
+                justify-content: center;
+                align-items: center;
+                height: 30vh;
+                font-size: 200%;
+              }
+              li:nth-child(even){
+                background-color: #ccc;
+              }
+            </style>
+          </head>
+          <body>
+            <ul>
+              <li>1</li>
+              <li>2</li>
+              <li>3</li>
+              <li>4</li>
+              <li>5</li>
+              <li>6</li>
+              <li>7</li>
+              <li>8</li>
+              <li>9</li>
+              <li>10</li>
+            </ul>
+          </body>
+        </html>`,
+    },
+  });
+
+  await extension.startup();
+
+  await SpecialPowers.pushPrefEnv({ set: [["apz.popups.enabled", true]] });
+
+  // Open the popup window of the extension.
+  const browserForPopup = await openBrowserActionPanel(
+    extension,
+    undefined,
+    true
+  );
+
+  // Flush APZ repaints and waits for MozAfterPaint to make sure APZ state is
+  // stable.
+  await promiseApzFlushedRepaintsInPopup(browserForPopup);
+
+  const scrollEventPromise = SpecialPowers.spawn(
+    browserForPopup,
+    [],
+    async () => {
+      return new Promise(resolve => {
+        content.window.addEventListener(
+          "scroll",
+          event => {
+            dump("Got a scroll event in the popup content document\n");
+            resolve();
+          },
+          { once: true }
+        );
+      });
+    }
+  );
+
+  // Send native mouse wheel to scroll the content in the popup.
+  await promiseNativeWheelAndWaitForObserver(browserForPopup, 50, 50, 0, -100);
+
+  // Flush APZ repaints and waits for MozAfterPaint to make sure the scroll has
+  // been reflected on the main thread.
+  const apzPromise = promiseApzFlushedRepaintsInPopup(browserForPopup);
+
+  await Promise.all([apzPromise, scrollEventPromise]);
+
+  const scrollY = await SpecialPowers.spawn(browserForPopup, [], () => {
+    return content.window.scrollY;
+  });
+  ok(scrollY > 0, "Mouse wheel scrolling works in the popup window");
+
+  await closeBrowserAction(extension);
+
+  await extension.unload();
+});