Browser test that demonstrates failure to run subframe unload handlers.

content/browser/loader/resource_dispatcher_host_browsertest.cc

Index: content/browser/loader/resource_dispatcher_host_browsertest.cc
diff --git a/content/browser/loader/resource_dispatcher_host_browsertest.cc b/content/browser/loader/resource_dispatcher_host_browsertest.cc
index 3a3a13d5550a94384a5e8d3d346ed4bb960aa980..74eb0099a59e3553e10f9a34539fd12a8a352f4f 100644
--- a/content/browser/loader/resource_dispatcher_host_browsertest.cc
+++ b/content/browser/loader/resource_dispatcher_host_browsertest.cc
@@ -259,6 +259,26 @@ IN_PROC_BROWSER_TEST_F(ResourceDispatcherHostBrowserTest,
   EXPECT_EQ("onunloadCookie=foo", GetCookies(url));
 }
 
+IN_PROC_BROWSER_TEST_F(ResourceDispatcherHostBrowserTest,
+                       CrossSiteOnunloadCookieInFrame) {
+  ASSERT_TRUE(embedded_test_server()->Start());
+
+  CheckTitleTest(
+      embedded_test_server()->GetURL("/onunload_cookie_wrapper.html"),
+      "set cookie on unload");
+
+  // Navigate to a new cross-site page, to dispatch unload event and set the
+  // cookie.
+  CheckTitleTest(
+      net::URLRequestMockHTTPJob::GetMockUrl("content-sniffer-test0.html"),
+      "Content Sniffer Test 0");
+
+  // Currently, subframe unloads happen after the IPC filter for swapped out
+  // renderers is installed, so we won't see the cookie set...
+  EXPECT_EQ(
+      "", GetCookies(embedded_test_server()->GetURL("/onunload_cookie.html")));
+}
+
 // If this flakes, use http://crbug.com/130404
 // Tests that onunload is run for cross-site requests to URLs that complete
 // without network loads (e.g., about:blank, data URLs).