Add cross origin to Blink-driven preconnect

chrome/browser/net/predictor_browsertest.cc

Index: chrome/browser/net/predictor_browsertest.cc
diff --git a/chrome/browser/net/predictor_browsertest.cc b/chrome/browser/net/predictor_browsertest.cc
index 345b4ecdc690c99ddb9aecf3286ba0911229b26a..d8fec138848a0c13e3bed852a8bad54bf57d2832 100644
--- a/chrome/browser/net/predictor_browsertest.cc
+++ b/chrome/browser/net/predictor_browsertest.cc
@@ -309,5 +309,29 @@ IN_PROC_BROWSER_TEST_F(PredictorBrowserTest, Preconnect) {
   net_log_observer.Detach();
 }
 
+IN_PROC_BROWSER_TEST_F(PredictorBrowserTest, PreconnectAnonymous) {
+  ASSERT_TRUE(test_server()->Start());
+
+  // Create a HTML preconnect reference to the local server in the form
+  // <link rel="preconnect" href="http://test-server/">
+  // and navigate to it as a data URI.
+  GURL preconnect_url = test_server()->GetURL("");
+  std::string preconnect_content =
+      "<link rel=\"preconnect\" crossorigin href=\""
+      + preconnect_url.spec() + "\">";
+  std::string encoded;
+  base::Base64Encode(preconnect_content, &encoded);
+  std::string data_uri = "data:text/html;base64," + encoded;
+
+  net::HostPortPair host_port_pair = net::HostPortPair::FromURL(preconnect_url);
+  ConnectNetLogObserver net_log_observer("pm/" + host_port_pair.ToString());
+  net_log_observer.Attach();

[Ryan Sleevi, 2015/05/12 15:49:43]

As far as tests go, I would have a hard time approving this test. It is reaching
too much into the internal implementation details of //net to accomplish its
results.

The canonical way would be to ask the rest server how many sockets had
connected. However, that means _not_ using the SpawnedTestServer, as it will go
all explody when you have multiple connections. The EmbeddedTestServer should be
sufficient.

This test also hangs if your conditions aren't met, and so that's a recipe for a
bad time too. However, resolving that will be trickier.

+
+  ui_test_utils::NavigateToURL(browser(), GURL(data_uri));
+
+  net_log_observer.WaitForConnect();
+  net_log_observer.Detach();
+}
+
 }  // namespace chrome_browser_net