From 73dd945ce013c6c7550285f640cf8c9169182b1e Mon Sep 17 00:00:00 2001
From: Hiroyuki Ikezoe <hikezoe.birchill@mozilla.com>
Date: Thu, 19 Jan 2023 21:07:44 +0000
Subject: [PATCH] Bug 1810819 - Add NativePanHandlerForHeadless. r=botond

Differential Revision: https://phabricator.services.mozilla.com/D167111
---
 .../test/mochitest/apz_test_native_event_utils.js    | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/gfx/layers/apz/test/mochitest/apz_test_native_event_utils.js b/gfx/layers/apz/test/mochitest/apz_test_native_event_utils.js
index 1a7ef7f34591..785a4f3b9b59 100644
--- a/gfx/layers/apz/test/mochitest/apz_test_native_event_utils.js
+++ b/gfx/layers/apz/test/mochitest/apz_test_native_event_utils.js
@@ -1815,7 +1815,19 @@ const NativePanHandlerForMac = {
   delta: -50,
 };
 
+const NativePanHandlerForHeadless = {
+  beginPhase: SpecialPowers.DOMWindowUtils.PHASE_BEGIN,
+  updatePhase: SpecialPowers.DOMWindowUtils.PHASE_UPDATE,
+  endPhase: SpecialPowers.DOMWindowUtils.PHASE_END,
+  promiseNativePanEvent: promiseNativeTouchpadPanEventAndWaitForObserver,
+  delta: 50,
+};
+
 function getPanHandler() {
+  if (SpecialPowers.isHeadless) {
+    return NativePanHandlerForHeadless;
+  }
+
   switch (getPlatform()) {
     case "linux":
       return NativePanHandlerForLinux;