Add cross origin to Blink-driven preconnect

chrome/browser/net/predictor_browsertest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdint.h>
 
 #include "base/base64.h"
 #include "base/command_line.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/macros.h"
@@ skipping 365 matching lines @@
 
   // Second navigation to content with an img.
   std::string img_content =
       "<img src=\"" + preconnect_url.spec() + "test.gif\">";
   NavigateToDataURLWithContent(img_content);
   connection_listener_->WaitUntilFirstConnectionRead();
   EXPECT_EQ(1u, connection_listener_->GetAcceptedSocketCount());
   EXPECT_EQ(1u, connection_listener_->GetReadSocketCount());
 }
 
+// Tests that preconnect warms up a crossorigin socket connection to a test
+// server, and that that socket is later used when fetching an anonymous
+// resource.
+// Note: This test uses a data URI to serve the preconnect hint, to make sure
+// that the network stack doesn't just re-use its connection to the test server.
+IN_PROC_BROWSER_TEST_F(PredictorBrowserTest, PreconnectAndUseAnonymous) {
+  GURL preconnect_url = embedded_test_server()->base_url();
+  // First navigation to content with a preconnect hint.
+  std::string preconnect_content = "<link rel=\"preconnect\" href=\"" +
+                                   preconnect_url.spec() + "\" crossorigin>";
+  NavigateToDataURLWithContent(preconnect_content);
+  connection_listener_->WaitUntilFirstConnectionAccepted();
+  EXPECT_EQ(1u, connection_listener_->GetAcceptedSocketCount());
+  EXPECT_EQ(0u, connection_listener_->GetReadSocketCount());
+
+  // Second navigation to content with a font.
+  std::string font_content = "<script>var font = new FontFace('FontA', 'url(" +
+                             preconnect_url.spec() +
+                             "test.woff2)');font.load();</script>";
+  NavigateToDataURLWithContent(font_content);
+  connection_listener_->WaitUntilFirstConnectionRead();
+  EXPECT_EQ(1u, connection_listener_->GetAcceptedSocketCount());
+  EXPECT_EQ(1u, connection_listener_->GetReadSocketCount());
+}
+
 }  // namespace chrome_browser_net