NoState Prefetch: nostate prefetch browser tests.

chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc

Index: chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc
diff --git a/chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc b/chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9c3cc0e2af18b37f47b85d0cc12d18b44d875aa8
--- /dev/null
+++ b/chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc
@@ -0,0 +1,550 @@
+// 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 "base/command_line.h"
+#include "base/strings/string16.h"
+#include "base/strings/string_split.h"
+#include "base/task_scheduler/post_task.h"
+#include "base/threading/platform_thread.h"  // For |Sleep()|.
+#include "chrome/browser/prerender/prerender_manager.h"
+#include "chrome/browser/prerender/prerender_manager_factory.h"
+#include "chrome/browser/prerender/prerender_test_utils.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/task_manager/task_manager_browsertest_util.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_commands.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/common/chrome_switches.h"
+#include "chrome/grit/generated_resources.h"
+#include "chrome/test/base/ui_test_utils.h"
+#include "content/public/common/content_switches.h"
+#include "content/public/common/url_constants.h"
+#include "content/public/test/browser_test_utils.h"
+#include "net/base/escape.h"
+#include "net/dns/mock_host_resolver.h"
+#include "net/test/embedded_test_server/request_handler_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/base/l10n/l10n_util.h"
+
+using prerender::test_utils::CreateCountingInterceptorOnIO;
+using prerender::test_utils::DestructionWaiter;
+using prerender::test_utils::RequestCounter;
+using prerender::test_utils::TestPrerender;
+using prerender::test_utils::TestPrerenderContents;
+using task_manager::browsertest_util::WaitForTaskManagerRows;
+
+namespace {
+const int kMetricsSendDelayMillis = 1500;
+
+// Fetches a boolean value from javascript. Returns whether the fetch
+// succeeded; the value of the variable is returned in value. If
+// javascript_variable does not exist, this returns false and value is
+// unchanged. The function checks that script execution works.
+bool GetJavascriptBoolean(const std::string& javascript_variable,
+                          content::WebContents* web_contents,
+                          bool* value) {
+  // In order to detect unknown variables a three-valued return is needed.
+  int result;
+  EXPECT_TRUE(content::ExecuteScriptAndExtractInt(
+      web_contents,
+      "try { if (" + javascript_variable + ") { " +
+          "window.domAutomationController.send(1) } else { " +
+          "window.domAutomationController.send(0); } } catch(err) {" +
+          "window.domAutomationController.send(2) }",
+      &result));
+  if (result == 2) {
+    // This means an exception was caught, usually because of a missing
+    // variable.
+    return false;
+  }
+  *value = (result == 1);
+  return true;
+}
+
+// As above, but just checks for a missing variable.
+bool JavascriptVariableMissing(const std::string& javascript_variable,
+                               content::WebContents* web_contents) {
+  bool unused;
+  return !GetJavascriptBoolean(javascript_variable, web_contents, &unused);
+}
+
+}  // namespace
+
+namespace prerender {
+
+// These URLs used for test resources must be relative with the exception of
+// |PrefetchLoaderPath|, which is only used in |PrerenderTestURLImpl()|.
+const char kPrefetchImagePage[] = "prerender/prefetch_image.html";
+const char kPrefetchJpeg[] = "prerender/image.jpeg";
+const char kPrefetchLoaderPath[] = "/prerender/prefetch_loader.html";
+const char kPrefetchLoopPage[] = "prerender/prefetch_loop.html";
+const char kPrefetchPage[] = "prerender/prefetch_page.html";
+const char kPrefetchPage2[] = "prerender/prefetch_page2.html";
+const char kPrefetchPng[] = "prerender/image.png";
+const char kPrefetchScript[] = "prerender/prefetch.js";
+const char kPrefetchScript2[] = "prerender/prefetch2.js";
+const char kPrefetchSubresourceRedirectPage[] =
+    "prerender/prefetch_subresource_redirect.html";
+
+const char kPageBool[] = "pageBool";
+const char kScriptBool[] = "scriptBool";
+
+class NoStatePrefetchBrowserTest
+    : public test_utils::PrerenderInProcessBrowserTest {
+ public:
+  class BrowserTestTime : public PrerenderManager::TimeOverride {
+   public:
+    BrowserTestTime() {}
+
+    base::Time GetCurrentTime() const override {
+      if (delta_.is_zero()) {
+        return base::Time::Now();
+      }
+      return time_ + delta_;
+    }
+
+    base::TimeTicks GetCurrentTimeTicks() const override {
+      if (delta_.is_zero()) {
+        return base::TimeTicks::Now();
+      }
+      return time_ticks_ + delta_;
+    }
+
+    void AdvanceTime(base::TimeDelta delta) {
+      if (delta_.is_zero()) {
+        time_ = base::Time::Now();
+        time_ticks_ = base::TimeTicks::Now();
+        delta_ = delta;
+      } else {
+        delta_ += delta;
+      }
+    }
+
+   private:
+    base::Time time_;
+    base::TimeTicks time_ticks_;
+    base::TimeDelta delta_;
+  };
+
+  NoStatePrefetchBrowserTest() {}
+
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    PrerenderInProcessBrowserTest::SetUpCommandLine(command_line);
+    command_line->AppendSwitchASCII(
+        switches::kPrerenderMode, switches::kPrerenderModeSwitchValuePrefetch);
+  }
+
+  void SetUpOnMainThread() override {
+    PrerenderInProcessBrowserTest::SetUpOnMainThread();
+    std::unique_ptr<BrowserTestTime> test_time =
+        base::MakeUnique<BrowserTestTime>();
+    browser_test_time_ = test_time.get();
+    GetPrerenderManager()->SetTimeOverride(std::move(test_time));
+  }
+
+  // Set up a request counter for |path|, which is also the location of the data
+  // served by the request.
+  void CountRequestFor(const std::string& path_str, RequestCounter* counter) {
+    url::StringPieceReplacements<base::FilePath::StringType> replacement;
+    replacement.SetPathStr(base::FilePath::FromUTF8Unsafe(path_str).value());
+    const GURL url = src_server()->base_url().ReplaceComponents(replacement);
+    base::FilePath url_file = ui_test_utils::GetTestFilePath(
+        base::FilePath(), base::FilePath::FromUTF8Unsafe(path_str));
+    content::BrowserThread::PostTask(
+        content::BrowserThread::IO, FROM_HERE,
+        base::Bind(&CreateCountingInterceptorOnIO, url, url_file,
+                   counter->AsWeakPtr()));
+  }
+
+  BrowserTestTime* GetTimeOverride() const { return browser_test_time_; }
+
+  // Paint metrics do not reliably show until the page produces a frame.
+  void WaitForPaint() {
+    bool loaded = false;
+    ASSERT_TRUE(content::ExecuteScriptAndExtractBool(
+        current_browser()->tab_strip_model()->GetActiveWebContents(),
+        "requestAnimationFrame(function() {"
+        "  window.domAutomationController.send(true);"
+        "});",
+        &loaded));
+    ASSERT_TRUE(loaded);
+    // There can be a delay of up to a second to send performance stats. See
+    // PageTimingMetricsSender::Send.
+    base::PlatformThread::Sleep(
+        base::TimeDelta::FromMilliseconds(kMetricsSendDelayMillis));
+    // Pump the message loop as timing updates are sent from the renderer to the
+    // browser.
+    base::RunLoop loop;

[mattcary, 2016/10/13 13:40:38]

+pasko

Is this the right way to pump message loops so I know that the FCP timing stats
get processed before I start looking at histograms?

[pasko, 2016/10/13 14:00:44]

Yes. One caveat: when starting this pump we need to make sure the task being
waited for completion is already posted to this messageloop. Otherwise it still
can flake, right?

I suspect pulling paint metrics reliably is more tricky than this code aims at,
and those should not block landing the (awesome) testing infrastructure. Can we
land this without the paint-related tests and do the latter as a separate
change?

+    content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
+                                     loop.QuitClosure());
+    loop.Run();
+  }
+
+ private:
+  ScopedVector<TestPrerender> PrerenderTestURLImpl(
+      const GURL& prerender_url,
+      const std::vector<FinalStatus>& expected_final_status_queue,
+      int expected_number_of_loads) override {
+    base::StringPairs replacement_text;
+    replacement_text.push_back(
+        make_pair("REPLACE_WITH_PREFETCH_URL", prerender_url.spec()));
+    std::string replacement_path;
+    net::test_server::GetFilePathWithReplacements(
+        kPrefetchLoaderPath, replacement_text, &replacement_path);
+    GURL loader_url = src_server()->GetURL(replacement_path);
+
+    ScopedVector<TestPrerender> prerenders = NavigateWithPrerenders(
+        loader_url, expected_final_status_queue, expected_number_of_loads);
+
+    TestPrerenderContents* prerender_contents = prerenders[0]->contents();
+    CHECK(prerender_contents);
+    // Checks that the prerender contents final status is unchanged from its
+    // default value, meaning that the contents has not been destroyed.
+    EXPECT_EQ(FINAL_STATUS_MAX, prerender_contents->final_status());
+
+    EXPECT_EQ(expected_number_of_loads, prerenders[0]->number_of_loads());
+
+    return prerenders;
+  }
+
+  BrowserTestTime* browser_test_time_;
+};
+
+// Performs a full load of the target page and check that javascript values are
+// set as expected. This confirms that our test system is working correctly, so
+// that when the target page is prefetched it can be confirmed that javascript
+// is not executed.
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, CheckJavascript) {
+  ui_test_utils::NavigateToURL(
+      current_browser(), src_server()->GetURL(MakeAbsolute(kPrefetchPage)));
+  content::WebContents* web_contents =
+      current_browser()->tab_strip_model()->GetActiveWebContents();
+
+  // Confirms that true and false values can appear.
+  bool value = false;
+  EXPECT_TRUE(GetJavascriptBoolean(kPageBool, web_contents, &value));
+  EXPECT_TRUE(value);
+  value = true;
+  EXPECT_TRUE(GetJavascriptBoolean("pageAntiBool", web_contents, &value));
+  EXPECT_FALSE(value);
+
+  // Confirm a value from the script is plumbed through.
+  value = false;
+  EXPECT_TRUE(GetJavascriptBoolean(kScriptBool, web_contents, &value));
+  EXPECT_TRUE(value);
+
+  // Confirm that the expected happens when a value doesn't exist.
+  EXPECT_TRUE(JavascriptVariableMissing("iDontExist", web_contents));
+}
+
+// Checks that a page is correctly prefetched in the case of a
+// <link rel=prerender> tag and then loaded into a tab in response to a
+// navigation, when NoState Prefetch is enabled, but that the page is not loaded
+// (which confirmed by checking that javascript is not executed).
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, PrefetchSimple) {
+  RequestCounter script_counter;
+  CountRequestFor(kPrefetchScript, &script_counter);
+  RequestCounter main_counter;
+  CountRequestFor(kPrefetchPage, &main_counter);
+
+  std::unique_ptr<TestPrerender> test_prerender =
+      PrerenderTestURL(kPrefetchPage, FINAL_STATUS_APP_TERMINATING, 1);
+  main_counter.WaitForCount(1);
+  script_counter.WaitForCount(1);
+
+  content::WebContents* contents =
+      test_prerender->contents()->prerender_contents();
+  content::WebContents* active_contents =
+      current_browser()->tab_strip_model()->GetActiveWebContents();
+  EXPECT_TRUE(JavascriptVariableMissing(kPageBool, contents));
+  EXPECT_TRUE(JavascriptVariableMissing(kScriptBool, contents));
+  EXPECT_TRUE(JavascriptVariableMissing(kPageBool, active_contents));
+  EXPECT_TRUE(JavascriptVariableMissing(kScriptBool, active_contents));
+  histogram_tester().ExpectTotalCount("Prerender.PerceivedPLT", 1);
+  histogram_tester().ExpectBucketCount(
+      "Prerender.websame_NoStatePrefetchResponseTypes",
+      4 /* cacheable, main resource */, 1);
+  histogram_tester().ExpectBucketCount(
+      "Prerender.websame_NoStatePrefetchResponseTypes",
+      0 /* cacheable, non-main resource */, 1);
+  histogram_tester().ExpectTotalCount("Prerender.none_MainResourceRedirects",
+                                      0);
+  histogram_tester().ExpectTotalCount("Prerender.none_SubResourceRedirects", 0);
+}
+
+// Checks the TTFCP histograms on fast reuse of a prefetch.
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, PrefetchReusedWarm) {
+  PrerenderTestURL(kPrefetchPage, FINAL_STATUS_APP_TERMINATING, 1);
+  GetTimeOverride()->AdvanceTime(base::TimeDelta::FromSeconds(10));
+  ui_test_utils::NavigateToURL(
+      current_browser(), src_server()->GetURL(MakeAbsolute(kPrefetchPage)));
+  WaitForPaint();
+  histogram_tester().ExpectTotalCount(
+      "Prerender.websame_NoStatePrefetchTTFCP.Warm.Cacheable", 1);
+  histogram_tester().ExpectTotalCount(
+      "Prerender.websame_NoStatePrefetchTTFCP.Cold.Cacheable", 0);
+}
+
+// Checks the histograms on slow reuse of a prefetch.
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, PrefetchReusedCold) {
+  PrerenderTestURL(kPrefetchPage, FINAL_STATUS_TIMED_OUT, 1);
+  GetTimeOverride()->AdvanceTime(base::TimeDelta::FromSeconds(600));
+  ui_test_utils::NavigateToURL(
+      current_browser(), src_server()->GetURL(MakeAbsolute(kPrefetchPage)));
+  WaitForPaint();
+
+  histogram_tester().ExpectTotalCount(
+      "Prerender.websame_NoStatePrefetchTTFCP.Warm.Cacheable", 0);
+  histogram_tester().ExpectTotalCount(
+      "Prerender.websame_NoStatePrefetchTTFCP.Cold.Cacheable", 1);
+}
+
+// Checks the prefetch of an img tag.
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, PrefetchImage) {
+  RequestCounter image_counter;
+  CountRequestFor(kPrefetchJpeg, &image_counter);
+  base::StringPairs replacement_text;
+  replacement_text.push_back(
+      std::make_pair("REPLACE_WITH_IMAGE_URL", MakeAbsolute(kPrefetchJpeg)));
+  std::string main_page_path;
+  net::test_server::GetFilePathWithReplacements(
+      kPrefetchImagePage, replacement_text, &main_page_path);
+  // Note CountRequestFor cannot be used on the main page as the test server
+  // must handling the image url replacement.
+  PrerenderTestURL(main_page_path, FINAL_STATUS_APP_TERMINATING, 1);
+  image_counter.WaitForCount(1);
+}
+
+// Checks that a cross-domain prefetching works correctly by looking at
+// histograms.
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, PrefetchCrossDomain) {
+  static const std::string secondary_domain = "www.foo.com";
+  host_resolver()->AddRule(secondary_domain, "127.0.0.1");
+  GURL cross_domain_url(base::StringPrintf(
+      "http://%s:%d/%s", secondary_domain.c_str(),
+      embedded_test_server()->host_port_pair().port(), kPrefetchPage));
+  PrerenderTestURL(cross_domain_url, FINAL_STATUS_APP_TERMINATING, 1);
+  // TODO(mattcary): remove PLT histograms (here and elsewhere).
+  histogram_tester().ExpectTotalCount("Prerender.PerceivedPLT", 1);
+  histogram_tester().ExpectTotalCount("Prerender.none_PerceivedPLT", 1);
+  histogram_tester().ExpectTotalCount(
+      "Prerender.webcross_PrerenderNotSwappedInPLT", 1);
+}
+
+// Checks simultaneous prefetch.
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, PrefetchSimultaneous) {
+  RequestCounter first_main_counter;
+  CountRequestFor(kPrefetchPage, &first_main_counter);
+  RequestCounter second_main_counter;
+  CountRequestFor(kPrefetchPage2, &second_main_counter);
+  RequestCounter first_script_counter;
+  CountRequestFor(kPrefetchScript, &first_script_counter);
+  RequestCounter second_script_counter;
+  CountRequestFor(kPrefetchScript2, &second_script_counter);
+
+  // The first prerender is marked as canceled as when the second starts, it
+  // sees that the first has been abandoned (presumably because it is detached
+  // immediately and so dies quickly).
+  PrerenderTestURL(kPrefetchPage, FINAL_STATUS_CANCELLED, 1);
+  PrerenderTestURL(kPrefetchPage2, FINAL_STATUS_APP_TERMINATING, 1);
+  first_main_counter.WaitForCount(1);
+  second_main_counter.WaitForCount(1);
+  first_script_counter.WaitForCount(1);
+  second_script_counter.WaitForCount(1);
+  histogram_tester().ExpectTotalCount("Prerender.PerceivedPLT", 2);
+  histogram_tester().ExpectTotalCount("Prerender.none_PerceivedPLT", 2);
+}
+
+// Checks a prefetch to a nonexisting page.
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, PrefetchNonexisting) {
+  PrerenderTestURL("nonexisting-page.html", FINAL_STATUS_APP_TERMINATING, 0);
+  // TODO(mattcary): we fire up a prerenderer before we discover that the main
+  // page doesn't exist, we still count this as a prerender. Also we don't fail
+  // the renderer (presumably because we've detached the resource, etc). Is this
+  // what we want?
+  histogram_tester().ExpectTotalCount("Prerender.PerceivedPLT", 1);
+}
+
+// Checks that a 301 redirect is followed.
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, Prefetch301Redirect) {
+  RequestCounter script_counter;
+  CountRequestFor(kPrefetchScript, &script_counter);
+  PrerenderTestURL(
+      "/server-redirect/?" +
+          net::EscapeQueryParamValue(MakeAbsolute(kPrefetchPage), false),
+      FINAL_STATUS_APP_TERMINATING, 1);
+  script_counter.WaitForCount(1);
+  histogram_tester().ExpectTotalCount(
+      "Prerender.websame_NoStatePrefetchMainResourceRedirects", 1);
+}
+
+// Checks that a subresource 301 redirect is followed.
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, Prefetch301Subresource) {
+  RequestCounter script_counter;
+  CountRequestFor(kPrefetchScript, &script_counter);
+  PrerenderTestURL(kPrefetchSubresourceRedirectPage,
+                   FINAL_STATUS_APP_TERMINATING, 1);
+  script_counter.WaitForCount(1);
+  histogram_tester().ExpectTotalCount(
+      "Prerender.websame_NoStatePrefetchMainResourceRedirects", 1);
+}
+
+// Checks a client redirect is not followed.
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, PrefetchClientRedirect) {
+  RequestCounter script_counter;
+  CountRequestFor(kPrefetchScript, &script_counter);
+  // A complete load of kPrefetchPage2 is used as a sentinal. Otherwise the test
+  // ends before script_counter would reliably see the load of kPrefetchScript,
+  // were it to happen.
+  RequestCounter sentinel_counter;
+  CountRequestFor(kPrefetchScript2, &sentinel_counter);
+  PrerenderTestURL(
+      "/client-redirect/?" +
+          net::EscapeQueryParamValue(MakeAbsolute(kPrefetchPage), false),
+      FINAL_STATUS_APP_TERMINATING, 1);
+  ui_test_utils::NavigateToURL(
+      current_browser(), src_server()->GetURL(MakeAbsolute(kPrefetchPage2)));
+  WaitForPaint();
+  sentinel_counter.WaitForCount(1);
+  script_counter.WaitForCount(0);
+}
+
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, PrefetchHttps) {
+  UseHttpsSrcServer();
+  RequestCounter main_counter;
+  CountRequestFor(kPrefetchPage, &main_counter);
+  RequestCounter script_counter;
+  CountRequestFor(kPrefetchScript, &script_counter);
+  PrerenderTestURL(kPrefetchPage, FINAL_STATUS_APP_TERMINATING, 1);
+  main_counter.WaitForCount(1);
+  script_counter.WaitForCount(1);
+}
+
+// Checks that an SSL error prevents prefetch.
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, SSLError) {
+  // Only send the loaded page, not the loader, through SSL.
+  net::EmbeddedTestServer https_server(net::EmbeddedTestServer::TYPE_HTTPS);
+  https_server.SetSSLConfig(net::EmbeddedTestServer::CERT_MISMATCHED_NAME);
+  https_server.ServeFilesFromSourceDirectory("chrome/test/data");
+  ASSERT_TRUE(https_server.Start());
+  std::unique_ptr<TestPrerender> prerender =
+      PrerenderTestURL(https_server.GetURL(MakeAbsolute(kPrefetchPage)),
+                       FINAL_STATUS_SSL_ERROR, 0);
+  DestructionWaiter waiter(prerender->contents(), FINAL_STATUS_SSL_ERROR);
+  EXPECT_TRUE(waiter.WaitForDestroy());
+}
+
+// Checks that a subresource failing SSL does not prevent prefetch on the rest
+// of the page.
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, SSLSubresourceError) {
+  // First confirm that the image loads as expected.
+
+  // A separate HTTPS server is started for the subresource; src_server() is
+  // non-HTTPS.
+  net::EmbeddedTestServer https_server(net::EmbeddedTestServer::TYPE_HTTPS);
+  https_server.SetSSLConfig(net::EmbeddedTestServer::CERT_MISMATCHED_NAME);
+  https_server.ServeFilesFromSourceDirectory("chrome/test/data");
+  ASSERT_TRUE(https_server.Start());
+  GURL https_url = https_server.GetURL("/prerender/image.jpeg");
+  base::StringPairs replacement_text;
+  replacement_text.push_back(
+      std::make_pair("REPLACE_WITH_IMAGE_URL", https_url.spec()));
+  std::string main_page_path;
+  net::test_server::GetFilePathWithReplacements(
+      kPrefetchImagePage, replacement_text, &main_page_path);
+  RequestCounter script_counter;
+  CountRequestFor(kPrefetchScript, &script_counter);
+
+  std::unique_ptr<TestPrerender> prerender =
+      PrerenderTestURL(main_page_path, FINAL_STATUS_APP_TERMINATING, 1);
+  // Checks that the presumed failure of the image load didn't affect the script
+  // fetch. This assumes waiting for the script load is enough to see any error
+  // from the image load.
+  script_counter.WaitForCount(1);
+}
+
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, Loop) {
+  RequestCounter script_counter;
+  CountRequestFor(kPrefetchScript, &script_counter);
+  RequestCounter main_counter;
+  CountRequestFor(kPrefetchLoopPage, &main_counter);
+
+  std::unique_ptr<TestPrerender> test_prerender =
+      PrerenderTestURL(kPrefetchLoopPage, FINAL_STATUS_APP_TERMINATING, 1);
+  main_counter.WaitForCount(1);
+  script_counter.WaitForCount(1);
+}
+
+#if defined(ENABLE_TASK_MANAGER)
+
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest,
+                       OpenTaskManagerBeforePrefetch) {
+  const base::string16 any_prerender = MatchTaskManagerPrerender("*");
+  const base::string16 any_tab = MatchTaskManagerTab("*");
+  const base::string16 original = MatchTaskManagerTab("Prefetch Loader");
+  // The page title is not visible in the task manager, presumably because the
+  // page has not been fully parsed.
+  const base::string16 prerender =
+      MatchTaskManagerPrerender("*prefetch_page.html*");
+
+  // Show the task manager. This populates the model.
+  chrome::OpenTaskManager(current_browser());
+  ASSERT_NO_FATAL_FAILURE(WaitForTaskManagerRows(1, any_tab));
+  ASSERT_NO_FATAL_FAILURE(WaitForTaskManagerRows(0, any_prerender));
+
+  // Prerender a page in addition to the original tab.
+  PrerenderTestURL(kPrefetchPage, FINAL_STATUS_APP_TERMINATING, 1);
+
+  // A TaskManager entry should appear like "Prerender: Prerender Page"
+  // alongside the original tab entry. There should be just these two entries.
+  ASSERT_NO_FATAL_FAILURE(WaitForTaskManagerRows(1, prerender));
+  ASSERT_NO_FATAL_FAILURE(WaitForTaskManagerRows(1, original));
+  ASSERT_NO_FATAL_FAILURE(WaitForTaskManagerRows(1, any_prerender));
+  ASSERT_NO_FATAL_FAILURE(WaitForTaskManagerRows(1, any_tab));
+}
+
+#endif  // defined(ENABLE_TASK_MANAGER)
+
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, RendererCrash) {
+  std::unique_ptr<TestPrerender> prerender =
+      PrerenderTestURL(kPrefetchPage, FINAL_STATUS_RENDERER_CRASHED, 1);
+  prerender->contents()->prerender_contents()->GetController().LoadURL(
+      GURL(content::kChromeUICrashURL), content::Referrer(),
+      ui::PAGE_TRANSITION_TYPED, std::string());
+  prerender->WaitForStop();
+}
+
+// Checks that the prefetch of png correctly loads the png.
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, Png) {
+  RequestCounter counter;
+  CountRequestFor(kPrefetchPng, &counter);
+  PrerenderTestURL(kPrefetchPng, FINAL_STATUS_APP_TERMINATING, 1);
+  counter.WaitForCount(1);
+}
+
+// Checks that the prefetch of png correctly loads the jpeg.
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, Jpeg) {
+  RequestCounter counter;
+  CountRequestFor(kPrefetchJpeg, &counter);
+  PrerenderTestURL(kPrefetchJpeg, FINAL_STATUS_APP_TERMINATING, 1);
+  counter.WaitForCount(1);
+}
+
+// Checks that nothing is prefetched from malware sites.
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest,
+                       PrerenderSafeBrowsingTopLevel) {
+  GURL url = src_server()->GetURL(MakeAbsolute(kPrefetchPage));
+  GetFakeSafeBrowsingDatabaseManager()->SetThreatTypeForUrl(
+      url, safe_browsing::SB_THREAT_TYPE_URL_MALWARE);
+  // Prefetch resources are blocked, but the prerender is not killed in any
+  // special way.
+  // TODO(mattcary): since the prerender will count itself as loaded even if the
+  // fetch of the main resource fails, the test doesn't actually confirm what we
+  // want it to confirm. This may be fixed by planned changes to the prerender
+  // lifecycle.
+  std::unique_ptr<TestPrerender> prerender =
+      PrerenderTestURL(kPrefetchPage, FINAL_STATUS_TESTING_IGNORE, 1);
+}
+
+}  // namespace prerender