predictors: Make speculative_prefetch_predictor work with PlzNavigate

chrome/browser/predictors/resource_prefetch_predictor_browsertest.cc

 // Copyright 2016 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 <set>
+
 #include "base/command_line.h"
 #include "chrome/browser/browsing_data/browsing_data_helper.h"
 #include "chrome/browser/browsing_data/browsing_data_remover.h"
 #include "chrome/browser/browsing_data/browsing_data_remover_factory.h"
 #include "chrome/browser/predictors/resource_prefetch_predictor.h"
 #include "chrome/browser/predictors/resource_prefetch_predictor_factory.h"
 #include "chrome/browser/predictors/resource_prefetch_predictor_test_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
-#include "content/public/browser/render_frame_host.h"
-#include "content/public/browser/render_process_host.h"
+#include "net/base/host_port_pair.h"
+#include "net/dns/mock_host_resolver.h"
 #include "net/test/embedded_test_server/http_request.h"
 #include "net/test/embedded_test_server/http_response.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace predictors {
 
 namespace {
 
+const char kFooHost[] = "foo.com";
+const char kBarHost[] = "bar.com";
+
 const char kImageMime[] = "image/png";
 const char kStyleMime[] = "text/css";
 const char kJavascriptMime[] = "application/javascript";
 
 // Paths to resources handled by a custom request handler. They return empty
 // responses with controllable response headers.
 const char kImagePath[] = "/handled-by-test/image.png";
 const char kImagePath2[] = "/handled-by-test/image2.png";
 const char kStylePath[] = "/handled-by-test/style.css";
 const char kStylePath2[] = "/handled-by-test/style2.css";
@@ skipping 86 matching lines @@
       std::unique(subresources->begin(), subresources->end(),
                   [](const URLRequestSummary& x, const URLRequestSummary& y) {
                     return x.resource_url == y.resource_url;
                   }),
       subresources->end());
 }
 
 // Fill a NavigationID with "empty" data that does not trigger
 // the is_valid DCHECK(). Allows comparing.
 void SetValidNavigationID(NavigationID* navigation_id) {
-  navigation_id->render_process_id = 0;
-  navigation_id->render_frame_id = 0;
+  navigation_id->tab_id = 0;
   navigation_id->main_frame_url = GURL("http://127.0.0.1");
 }
 
 void ModifySubresourceForComparison(URLRequestSummary* subresource,
                                     bool match_navigation_id) {
   if (!match_navigation_id)
     SetValidNavigationID(&subresource->navigation_id);
   if (subresource->resource_type == content::RESOURCE_TYPE_IMAGE &&
       subresource->priority == net::LOWEST) {
     // Fuzzy comparison for images because an image priority can be
@@ skipping 38 matching lines @@
         url_visit_count_(expected_url_visit_count),
         summary_(expected_summary),
         match_navigation_id_(match_navigation_id) {}
 
   // TestObserver:
   void OnNavigationLearned(size_t url_visit_count,
                            const PageRequestSummary& summary) override {
     EXPECT_EQ(url_visit_count, url_visit_count_);
     EXPECT_EQ(summary.main_frame_url, summary_.main_frame_url);
     EXPECT_EQ(summary.initial_url, summary_.initial_url);
+    for (const auto& resource : summary.subresource_requests)
+      current_navigation_ids_.insert(resource.navigation_id);
     CompareSubresources(summary.subresource_requests,
                         summary_.subresource_requests, match_navigation_id_);
     run_loop_.Quit();
   }
 
   void Wait() { run_loop_.Run(); }
 
+  std::set<NavigationID>& current_navigation_ids() {
+    return current_navigation_ids_;
+  }
+
  private:
   base::RunLoop run_loop_;
   size_t url_visit_count_;
   PageRequestSummary summary_;
   bool match_navigation_id_;
+  std::set<NavigationID> current_navigation_ids_;
 
   DISALLOW_COPY_AND_ASSIGN(LearningObserver);
 };
 
 // Helper class to track and allow waiting for a single OnPrefetchingFinished
 // event. No learning events should be fired while this observer is active.
 class PrefetchingObserver : public TestObserver {
  public:
   PrefetchingObserver(ResourcePrefetchPredictor* predictor,
                       const GURL& expected_main_frame_url)
@@ skipping 23 matching lines @@
  protected:
   using URLRequestSummary = ResourcePrefetchPredictor::URLRequestSummary;
 
   void SetUpCommandLine(base::CommandLine* command_line) override {
     command_line->AppendSwitchASCII(
         switches::kSpeculativeResourcePrefetching,
         switches::kSpeculativeResourcePrefetchingEnabledExternal);
   }
 
   void SetUpOnMainThread() override {
+    // Resolving all hosts to local allows us to have
+    // cross domains navigations (matching url_visit_count_, etc).
+    host_resolver()->AddRule("*", "127.0.0.1");
     embedded_test_server()->RegisterRequestHandler(
         base::Bind(&ResourcePrefetchPredictorBrowserTest::HandleRedirectRequest,
                    base::Unretained(this)));
     embedded_test_server()->RegisterRequestHandler(
         base::Bind(&ResourcePrefetchPredictorBrowserTest::HandleResourceRequest,
                    base::Unretained(this)));
     ASSERT_TRUE(embedded_test_server()->Start());
     predictor_ =
         ResourcePrefetchPredictorFactory::GetForProfile(browser()->profile());
     ASSERT_TRUE(predictor_);
@@ skipping 17 matching lines @@
       const GURL& main_frame_url,
       WindowOpenDisposition disposition = WindowOpenDisposition::CURRENT_TAB) {
     GURL endpoint_url = GetRedirectEndpoint(main_frame_url);
     std::vector<URLRequestSummary> url_request_summaries;
     for (const auto& kv : resources_) {
       if (kv.second.is_no_store || !kv.second.should_be_recorded)
         continue;
       url_request_summaries.push_back(
           GetURLRequestSummaryForResource(endpoint_url, kv.second));
     }
+
+    bool match_navigation_id =
+        disposition == WindowOpenDisposition::CURRENT_TAB;
+
     LearningObserver observer(
         predictor_, UpdateAndGetVisitCount(main_frame_url),
         CreatePageRequestSummary(endpoint_url.spec(), main_frame_url.spec(),
                                  url_request_summaries),
-        true);  // Matching navigation id by default
+        match_navigation_id);
     ui_test_utils::NavigateToURLWithDisposition(
         browser(), main_frame_url, disposition,
         ui_test_utils::BROWSER_TEST_NONE);
     observer.Wait();
     for (auto& kv : resources_) {
       if (!kv.second.is_no_store && kv.second.should_be_recorded)
         kv.second.request.was_cached = true;
     }
+    for (const auto& nav : observer.current_navigation_ids())
+      navigation_id_history_.insert(nav);
   }
 
   void PrefetchURL(const GURL& main_frame_url) {
     PrefetchingObserver observer(predictor_, main_frame_url);
     predictor_->StartPrefetching(main_frame_url, PrefetchOrigin::EXTERNAL);
     observer.Wait();
     for (auto& kv : resources_) {
       if (!kv.second.is_no_store && kv.second.should_be_recorded)
         kv.second.request.was_cached = true;
     }
@@ skipping 35 matching lines @@
                         const std::vector<RedirectEdge>& redirect_chain) {
     ASSERT_FALSE(redirect_chain.empty());
     GURL current = initial_url;
     for (const auto& edge : redirect_chain) {
       auto result = redirects_.insert(std::make_pair(current, edge));
       EXPECT_TRUE(result.second) << current << " already has a redirect.";
       current = edge.url;
     }
   }
 
+  void ClearResources() { resources_.clear(); }
+
   void ClearCache() {
     BrowsingDataRemover* remover =
         BrowsingDataRemoverFactory::GetForBrowserContext(browser()->profile());
     BrowsingDataRemoverObserver observer(remover);
     remover->RemoveAndReply(BrowsingDataRemover::Unbounded(),
                             BrowsingDataRemover::REMOVE_CACHE,
                             BrowsingDataHelper::UNPROTECTED_WEB, &observer);
     observer.Wait();
 
     for (auto& kv : resources_)
@@ skipping 21 matching lines @@
   }
 
   // Returns the embedded test server working over HTTPS. Must be enabled by
   // calling EnableHttpsServer() before use.
   const net::EmbeddedTestServer* https_server() const {
     return https_server_.get();
   }
 
   net::EmbeddedTestServer* https_server() { return https_server_.get(); }
 
+  size_t navigation_ids_history_size() const {
+    return navigation_id_history_.size();
+  }
+
  private:
   // ResourcePrefetchPredictor needs to be initialized before the navigation
   // happens otherwise this navigation will be ignored by predictor.
   void EnsurePredictorInitialized() {
     if (predictor_->initialization_state_ ==
         ResourcePrefetchPredictor::INITIALIZED) {
       return;
     }
 
     InitializationObserver observer(predictor_);
     if (predictor_->initialization_state_ ==
         ResourcePrefetchPredictor::NOT_INITIALIZED) {
       predictor_->StartInitialization();
     }
     observer.Wait();
   }
 
   URLRequestSummary GetURLRequestSummaryForResource(
       const GURL& main_frame_url,
       const ResourceSummary& resource_summary) const {
     URLRequestSummary summary(resource_summary.request);
     content::WebContents* web_contents =
         browser()->tab_strip_model()->GetActiveWebContents();
-    int process_id = web_contents->GetRenderProcessHost()->GetID();
-    int frame_id = web_contents->GetMainFrame()->GetRoutingID();
     summary.navigation_id =
-        CreateNavigationID(process_id, frame_id, main_frame_url.spec());
+        NavigationID(web_contents, main_frame_url, base::TimeTicks::Now());
     return summary;
   }
 
   GURL GetRedirectEndpoint(const GURL& initial_url) const {
     GURL current = initial_url;
     while (true) {
       auto it = redirects_.find(current);
       if (it == redirects_.end())
         break;
       current = it->second.url;
     }
     return current;
   }
 
   std::unique_ptr<net::test_server::HttpResponse> HandleResourceRequest(
       const net::test_server::HttpRequest& request) const {
-    auto resource_it = resources_.find(request.GetURL());
+    GURL resource_url = request.GetURL();
+    // Retrieve the host that was used in the request because
+    // resource_url contains a resolved host (e.g. 127.0.0.1).
+    if (request.headers.find("Host") != request.headers.end()) {
+      auto host_port_pair =
+          net::HostPortPair::FromString(request.headers.at("Host"));
+      GURL::Replacements replace_host;
+      replace_host.SetHostStr(host_port_pair.host());
+      resource_url = resource_url.ReplaceComponents(replace_host);
+    } else {
+      ADD_FAILURE() << "Host header was not found in a HttpRequest to url: "
+                    << resource_url.spec();
+    }
+
+    auto resource_it = resources_.find(resource_url);
     if (resource_it == resources_.end())
       return nullptr;
 
     const ResourceSummary& summary = resource_it->second;
     if (summary.is_external)
       return nullptr;
 
     auto http_response =
         base::MakeUnique<net::test_server::BasicHttpResponse>();
     http_response->set_code(net::HTTP_OK);
@@ skipping 30 matching lines @@
 
   size_t UpdateAndGetVisitCount(const GURL& main_frame_url) {
     return ++visit_count_[main_frame_url];
   }
 
   ResourcePrefetchPredictor* predictor_;
   std::unique_ptr<net::EmbeddedTestServer> https_server_;
   std::map<GURL, ResourceSummary> resources_;
   std::map<GURL, RedirectEdge> redirects_;
   std::map<GURL, size_t> visit_count_;
+  std::set<NavigationID> navigation_id_history_;
 };
 
 IN_PROC_BROWSER_TEST_F(ResourcePrefetchPredictorBrowserTest, Simple) {
   // These resources have default priorities that correspond to
   // blink::typeToPriority function.
   AddResource(GetURL(kImagePath), content::RESOURCE_TYPE_IMAGE, net::LOWEST);
   AddResource(GetURL(kStylePath), content::RESOURCE_TYPE_STYLESHEET,
               net::HIGHEST);
   AddResource(GetURL(kScriptPath), content::RESOURCE_TYPE_SCRIPT, net::MEDIUM);
   AddResource(GetURL(kFontPath), content::RESOURCE_TYPE_FONT_RESOURCE,
@@ skipping 21 matching lines @@
   AddResource(GetURL(kImagePath), content::RESOURCE_TYPE_IMAGE, net::LOWEST);
   AddResource(GetURL(kStylePath), content::RESOURCE_TYPE_STYLESHEET,
               net::HIGHEST);
   AddResource(GetURL(kScriptPath), content::RESOURCE_TYPE_SCRIPT, net::MEDIUM);
   AddResource(GetURL(kFontPath), content::RESOURCE_TYPE_FONT_RESOURCE,
               net::HIGHEST);
   TestLearningAndPrefetching(GetURL(kRedirectPath));
 }
 
 IN_PROC_BROWSER_TEST_F(ResourcePrefetchPredictorBrowserTest,
-                       LearningAfterHttpToHttpsRedirect) {
+                       HttpToHttpsRedirect) {
   EnableHttpsServer();
   AddRedirectChain(GetURL(kRedirectPath),
                    {{net::HTTP_MOVED_PERMANENTLY,
                      https_server()->GetURL(kHtmlSubresourcesPath)}});
   AddResource(https_server()->GetURL(kImagePath), content::RESOURCE_TYPE_IMAGE,
               net::LOWEST);
   AddResource(https_server()->GetURL(kStylePath),
               content::RESOURCE_TYPE_STYLESHEET, net::HIGHEST);
   AddResource(https_server()->GetURL(kScriptPath),
               content::RESOURCE_TYPE_SCRIPT, net::MEDIUM);
   AddResource(https_server()->GetURL(kFontPath),
               content::RESOURCE_TYPE_FONT_RESOURCE, net::HIGHEST);
-  NavigateToURLAndCheckSubresources(GetURL(kRedirectPath));
-  // TODO(alexilin): Test learning and prefetching once crbug.com/650246 is
-  // fixed.
+  TestLearningAndPrefetching(GetURL(kRedirectPath));
 }
 
 IN_PROC_BROWSER_TEST_F(ResourcePrefetchPredictorBrowserTest,
                        JavascriptDocumentWrite) {
   auto externalScript =
       AddExternalResource(GetURL(kScriptDocumentWritePath),
                           content::RESOURCE_TYPE_SCRIPT, net::MEDIUM);
   externalScript->request.mime_type = kJavascriptMime;
   AddResource(GetURL(kImagePath), content::RESOURCE_TYPE_IMAGE, net::LOWEST);
   AddResource(GetURL(kStylePath), content::RESOURCE_TYPE_STYLESHEET,
@@ skipping 55 matching lines @@
   AddResource(GetURL(kImagePath2), content::RESOURCE_TYPE_IMAGE, net::LOWEST);
   AddResource(GetURL(kStylePath2), content::RESOURCE_TYPE_STYLESHEET,
               net::HIGHEST);
   AddResource(GetURL(kScriptPath2), content::RESOURCE_TYPE_SCRIPT, net::MEDIUM);
   // Included from <iframe src="html_subresources.html"> and not recored.
   AddUnrecordedResources({GetURL(kImagePath), GetURL(kStylePath),
                           GetURL(kScriptPath), GetURL(kFontPath)});
   TestLearningAndPrefetching(GetURL(kHtmlIframePath));
 }
 
+IN_PROC_BROWSER_TEST_F(ResourcePrefetchPredictorBrowserTest,
+                       CrossSiteNavigation) {
+  AddResource(embedded_test_server()->GetURL(kFooHost, kImagePath),
+              content::RESOURCE_TYPE_IMAGE, net::LOWEST);
+  AddResource(embedded_test_server()->GetURL(kFooHost, kStylePath),
+              content::RESOURCE_TYPE_STYLESHEET, net::HIGHEST);
+  AddResource(embedded_test_server()->GetURL(kFooHost, kScriptPath),
+              content::RESOURCE_TYPE_SCRIPT, net::MEDIUM);
+  AddResource(embedded_test_server()->GetURL(kFooHost, kFontPath),
+              content::RESOURCE_TYPE_FONT_RESOURCE, net::HIGHEST);
+  TestLearningAndPrefetching(
+      embedded_test_server()->GetURL(kFooHost, kHtmlSubresourcesPath));
+  ClearResources();
+
+  AddResource(embedded_test_server()->GetURL(kBarHost, kImagePath),
+              content::RESOURCE_TYPE_IMAGE, net::LOWEST);
+  AddResource(embedded_test_server()->GetURL(kBarHost, kStylePath),
+              content::RESOURCE_TYPE_STYLESHEET, net::HIGHEST);
+  AddResource(embedded_test_server()->GetURL(kBarHost, kScriptPath),
+              content::RESOURCE_TYPE_SCRIPT, net::MEDIUM);
+  AddResource(embedded_test_server()->GetURL(kBarHost, kFontPath),
+              content::RESOURCE_TYPE_FONT_RESOURCE, net::HIGHEST);
+  // Navigating to kBarHost, although done in the same tab, will generate a new
+  // process because of cross domain behavior of PlzNavigate.

[alexilin, 2016/12/22 15:40:58]

I think that the reasoning isn't quite correct.
The creation of a new process isn't connected with PlzNavigate, this is rather a
part of the site-per-process policy described here:
http://www.chromium.org/developers/design-documents/site-isolation

So I would suggest to paraphrase this as
"Navigating to kBarHost, although done in the same tab, will generate a new
process because of the site-per-process policy."
Or just
"Navigating to kBarHost, although done in the same tab, will generate a new
process."

+  TestLearningAndPrefetching(
+      embedded_test_server()->GetURL(kBarHost, kHtmlSubresourcesPath));
+}
+
+// In this test we are trying to assess if :
+// - Reloading in the same tab is using the same NavigationID.
+// - Navigation into a new tab, window or popup yields different NavigationID's.
+// - Navigating twice to a new browser/popup yields different NavigationID's.
+IN_PROC_BROWSER_TEST_F(ResourcePrefetchPredictorBrowserTest,
+                       TabIdBehavingAsExpected) {
+  AddResource(GetURL(kImagePath), content::RESOURCE_TYPE_IMAGE, net::LOWEST);
+  AddResource(GetURL(kStylePath), content::RESOURCE_TYPE_STYLESHEET,
+              net::HIGHEST);
+  AddResource(GetURL(kScriptPath), content::RESOURCE_TYPE_SCRIPT, net::MEDIUM);
+  AddResource(GetURL(kFontPath), content::RESOURCE_TYPE_FONT_RESOURCE,
+              net::HIGHEST);
+  NavigateToURLAndCheckSubresources(GetURL(kHtmlSubresourcesPath));
+  EXPECT_EQ(navigation_ids_history_size(), 1U);
+  ClearCache();
+  NavigateToURLAndCheckSubresources(GetURL(kHtmlSubresourcesPath));
+  EXPECT_EQ(navigation_ids_history_size(), 1U);
+  ClearCache();
+  NavigateToURLAndCheckSubresources(GetURL(kHtmlSubresourcesPath),
+                                    WindowOpenDisposition::NEW_BACKGROUND_TAB);
+  EXPECT_EQ(navigation_ids_history_size(), 2U);
+  ClearCache();
+  NavigateToURLAndCheckSubresources(GetURL(kHtmlSubresourcesPath),
+                                    WindowOpenDisposition::NEW_WINDOW);
+  EXPECT_EQ(navigation_ids_history_size(), 3U);
+  ClearCache();
+  NavigateToURLAndCheckSubresources(GetURL(kHtmlSubresourcesPath),
+                                    WindowOpenDisposition::NEW_POPUP);
+  EXPECT_EQ(navigation_ids_history_size(), 4U);
+}
+
 }  // namespace predictors