[reland] Change net's predictor_tab_helper to use the new content Navigation API

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 <stddef.h>
 #include <stdint.h>
 #include <algorithm>
 #include <memory>
 
 #include "base/base64.h"
@@ skipping 1049 matching lines @@
   EXPECT_EQ(0u, cross_site_connection_listener_->GetAcceptedSocketCount());
 
   ui_test_utils::NavigateToURL(browser(),
                                embedded_test_server()->GetURL("/title1.html"));
   // 3 preconnects expected because ((2 + .33)*.66 + .33)*.66 + 1 = 2.23.
   EXPECT_EQ(3, observer()->CrossSitePreconnected());
   cross_site_connection_listener_->WaitForAcceptedConnectionsOnUI(3u);
 }
 
 IN_PROC_BROWSER_TEST_F(PredictorBrowserTest,
+                       RendererInitiatedNavigationPreconnect) {
+  NavigateToCrossSiteHtmlUrl(1 /* num_cors */, "" /* file_suffix */);
+  EXPECT_EQ(1, observer()->CrossSiteLearned());
+  EXPECT_EQ(0u, cross_site_connection_listener_->GetAcceptedSocketCount());
+
+  // Now, navigate using a renderer initiated navigation and expect preconnects.
+  EXPECT_TRUE(content::ExecuteScript(
+      browser()->tab_strip_model()->GetActiveWebContents(),
+      "window.location.href='/title1.html'"));
+
+  // The renderer initiated navigation is not synchronous, so just wait for the
+  // preconnects to go through.
+  // Note that ceil(2 + .33) + 1 = 4.
+  cross_site_connection_listener_->WaitForAcceptedConnectionsOnUI(4u);
+}
+
+IN_PROC_BROWSER_TEST_F(PredictorBrowserTest,
                        PRE_ShutdownStartupCyclePreresolve) {
   // Prepare state that will be serialized on this shut-down and read on next
   // start-up. Ensure preresolution over preconnection.
   LearnAboutInitialNavigation(startup_url_);
   // The target url will have a expected connection count of 2 after this call.
   InstallPredictorObserver(referring_url_, target_url_);
   LearnFromNavigation(referring_url_, target_url_);
 
   // In order to reduce the expected connection count < .8, issue predictions 3
   // times. 2 * .66^3 ~= .58.
@@ skipping 140 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(2u, connection_listener_->GetAcceptedSocketCount());
   EXPECT_EQ(1u, connection_listener_->GetReadSocketCount());
 }
 
 }  // namespace chrome_browser_net