Add a test for the workaround for bug 89967.

chrome/browser/extensions/window_open_apitest.cc

Index: chrome/browser/extensions/window_open_apitest.cc
diff --git a/chrome/browser/extensions/window_open_apitest.cc b/chrome/browser/extensions/window_open_apitest.cc
index 44fbfc17806a30f2af98ea06b5d6bfe6188e3e73..58c0346d8845f9cb08449a4d4f949e99dbda61c2 100644
--- a/chrome/browser/extensions/window_open_apitest.cc
+++ b/chrome/browser/extensions/window_open_apitest.cc
@@ -171,3 +171,7 @@ class WindowOpenPanelTest : public ExtensionApiTest {
 IN_PROC_BROWSER_TEST_F(WindowOpenPanelTest, WindowOpenPanel) {
   ASSERT_TRUE(RunExtensionTest("window_open/panel")) << message_;
 }
+
+IN_PROC_BROWSER_TEST_F(ExtensionApiTest, WindowOpener) {
+  ASSERT_TRUE(RunExtensionTest("window_open/opener")) << message_;
+}