1 files changed, 86 insertions, 0 deletions
diff --git a/remote/shared/MobileTabBrowser.sys.mjs b/remote/shared/MobileTabBrowser.sys.mjs
new file mode 100644
index 0000000000..b61a1f9a9b
--- /dev/null
+++ b/remote/shared/MobileTabBrowser.sys.mjs
@@ -0,0 +1,86 @@
+/* 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/. */
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  GeckoViewTabUtil: "resource://gre/modules/GeckoViewTestUtils.sys.mjs",
+
+  windowManager: "chrome://remote/content/shared/WindowManager.sys.mjs",
+});
+
+// GeckoView shim for Desktop's gBrowser
+export class MobileTabBrowser {
+  constructor(window) {
+    this.window = window;
+  }
+
+  get tabs() {
+    return [this.window.tab];
+  }
+
+  get selectedTab() {
+    return this.window.tab;
+  }
+
+  set selectedTab(tab) {
+    if (tab != this.selectedTab) {
+      throw new Error("GeckoView only supports a single tab");
+    }
+
+    // Synthesize a custom TabSelect event to indicate that a tab has been
+    // selected even when we don't change it.
+    const event = this.window.CustomEvent("TabSelect", {
+      bubbles: true,
+      cancelable: false,
+      detail: {
+        previousTab: this.selectedTab,
+      },
+    });
+    this.window.document.dispatchEvent(event);
+  }
+
+  get selectedBrowser() {
+    return this.selectedTab.linkedBrowser;
+  }
+
+  addEventListener() {
+    this.window.addEventListener(...arguments);
+  }
+
+  /**
+   * Create a new tab.
+   *
+   * @param {string} uriString
+   *     The URI string to load within the newly opened tab.
+   *
+   * @returns {Promise<Tab>}
+   *     The created tab.
+   * @throws {Error}
+   *     Throws an error if the tab cannot be created.
+   */
+  addTab(uriString) {
+    return lazy.GeckoViewTabUtil.createNewTab(uriString);
+  }
+
+  getTabForBrowser(browser) {
+    if (browser != this.selectedBrowser) {
+      throw new Error("GeckoView only supports a single tab");
+    }
+
+    return this.selectedTab;
+  }
+
+  removeEventListener() {
+    this.window.removeEventListener(...arguments);
+  }
+
+  removeTab(tab) {
+    if (tab != this.selectedTab) {
+      throw new Error("GeckoView only supports a single tab");
+    }
+
+    return lazy.windowManager.closeWindow(this.window);
+  }
+}