1 files changed, 33 insertions, 0 deletions
diff --git a/toolkit/actors/AutoScrollParent.jsm b/toolkit/actors/AutoScrollParent.jsm
new file mode 100644
index 0000000000..f5e6b7b8c3
--- /dev/null
+++ b/toolkit/actors/AutoScrollParent.jsm
@@ -0,0 +1,33 @@
+/* vim: set ts=2 sw=2 sts=2 et tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+var EXPORTED_SYMBOLS = ["AutoScrollParent"];
+
+class AutoScrollParent extends JSWindowActorParent {
+  receiveMessage(msg) {
+    let browser = this.manager.browsingContext.top.embedderElement;
+    if (!browser) {
+      return null;
+    }
+
+    let data = msg.data;
+    switch (msg.name) {
+      case "Autoscroll:Start":
+        return Promise.resolve(browser.startScroll(data));
+      case "Autoscroll:MaybeStartInParent":
+        let parent = this.browsingContext.parent;
+        if (parent) {
+          let actor = parent.currentWindowGlobal.getActor("AutoScroll");
+          actor.sendAsyncMessage("Autoscroll:MaybeStart", data);
+        }
+        break;
+      case "Autoscroll:Cancel":
+        browser.cancelScroll();
+        break;
+    }
+    return null;
+  }
+}