Prerender: Confirm ServiceWorkers are invoked for NoState Prefetch

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
index 6c1d72ff9bc201bdcb292665c6110df47712c3d7..906aba7456f26f76e14ddd5c1808f95ffc40c57e 100644
--- a/chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc
+++ b/chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc
@@ -49,6 +49,7 @@ 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";
 
@@ -514,4 +515,24 @@ IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, IssuesIdlePriorityRequests) {
   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