Prerender: Confirm ServiceWorkers are invoked for NoState Prefetch

chrome/browser/prerender/prerender_nostate_prefetch_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 "base/command_line.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_split.h"
 #include "base/task_scheduler/post_task.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/history/history_test_utils.h"
@@ skipping 31 matching lines @@
 const char kPrefetchLoaderPath[] = "/prerender/prefetch_loader.html";
 const char kPrefetchLoopPage[] = "prerender/prefetch_loop.html";
 const char kPrefetchMetaCSP[] = "prerender/prefetch_meta_csp.html";
 const char kPrefetchPage[] = "prerender/prefetch_page.html";
 const char kPrefetchPage2[] = "prerender/prefetch_page2.html";
 const char kPrefetchPng[] = "prerender/image.png";
 const char kPrefetchResponseHeaderCSP[] =
     "prerender/prefetch_response_csp.html";
 const char kPrefetchScript[] = "prerender/prefetch.js";
 const char kPrefetchScript2[] = "prerender/prefetch2.js";
+const char kServiceWorkerLoader[] = "prerender/service_worker.html";
 const char kPrefetchSubresourceRedirectPage[] =
     "prerender/prefetch_subresource_redirect.html";
 
 class NoStatePrefetchBrowserTest
     : public test_utils::PrerenderInProcessBrowserTest {
  public:
   NoStatePrefetchBrowserTest() {}
 
   void SetUpOnMainThread() override {
     test_utils::PrerenderInProcessBrowserTest::SetUpOnMainThread();
@@ skipping 445 matching lines @@
         constexpr net::RequestPriority kExpectedPriority = net::HIGHEST;
 #else
         constexpr net::RequestPriority kExpectedPriority = net::IDLE;
 #endif
         EXPECT_EQ(kExpectedPriority, request->priority());
       }));
   PrefetchFromFile(kPrefetchPage, FINAL_STATUS_NOSTATE_PREFETCH_FINISHED);
   script_counter.WaitForCount(1);
 }
 
+// Checks that prefetch is canceled when there is a ServiceWorker.
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, CancelOnServiceWorker) {
+  ui_test_utils::NavigateToURL(
+      current_browser(),
+      src_server()->GetURL(MakeAbsolute(kServiceWorkerLoader)));
+
+  PrefetchFromFile(kPrefetchPage, FINAL_STATUS_SERVICE_WORKER);
+}
+
+IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, CheckNoSW) {

[mattcary, 2016/12/13 16:08:47]

This test here shows that a SW actually exists: I changed the service worker to
rewrite the main page with an image url, and running that with this test shows
that the preload scanner sees the png.

So prefetching with a SW may actually be valid. There are probably corner cases,
like if the SW process gets killed, that I'd have to look into to figure out how
to check.

So I wonder what we want to do. Maybe we don't kill nostate if there's a service
worker?

+  ui_test_utils::NavigateToURL(
+      current_browser(),
+      src_server()->GetURL(MakeAbsolute(kServiceWorkerLoader)));
+
+  RequestCounter png;
+  CountRequestFor(kPrefetchPng, &png);
+  PrefetchFromFile(kPrefetchPage, FINAL_STATUS_SERVICE_WORKER);
+  png.WaitForCount(1);
+}
+
 }  // namespace prerender