[NoStatePrefetch] Cancel repeated prefetches with FINAL_STATUS_DUPLICATE

chrome/browser/prerender/prerender_unittest.cc

Index: chrome/browser/prerender/prerender_unittest.cc
diff --git a/chrome/browser/prerender/prerender_unittest.cc b/chrome/browser/prerender/prerender_unittest.cc
index f9961bac1840cfe0e924d3a5f2ddca411a21f326..ed84fbb2b80ddcc64c19a657e50879fbc798231e 100644
--- a/chrome/browser/prerender/prerender_unittest.cc
+++ b/chrome/browser/prerender/prerender_unittest.cc
@@ -781,6 +781,39 @@ TEST_F(PrerenderTest, LinkManagerNavigateAwayLaunchAnother) {
             prerender_manager()->FindEntry(second_url));
 }
 
+// Prefetching the same URL twice during |time_to_live| results in a duplicate
+// and is aborted.
+TEST_F(PrerenderTest, NoStatePrefetchDuplicate) {
+  const GURL kUrl("http://www.google.com/");
+  const TimeDelta kTimeToLive = TimeDelta::FromSeconds(300);
+  const TimeDelta kTestAdvance = TimeDelta::FromSeconds(100);
+
+  RestorePrerenderMode restore_prerender_mode;
+  prerender_manager()->SetMode(
+      PrerenderManager::PRERENDER_MODE_NOSTATE_PREFETCH);
+  base::SimpleTestTickClock* tick_clock =
+      OverridePrerenderManagerTimeTicks(prerender_manager());
+  prerender_manager()->mutable_config().time_to_live = kTimeToLive;
+
+  // Prefetch the url once.
+  prerender_manager()->CreateNextPrerenderContents(
+      kUrl, ORIGIN_OMNIBOX, FINAL_STATUS_MANAGER_SHUTDOWN);
+  EXPECT_TRUE(
+      prerender_manager()->AddPrerenderFromOmnibox(kUrl, nullptr, gfx::Size()));
+
+  prerender_manager()->CreateNextPrerenderContents(
+      kUrl, ORIGIN_OMNIBOX, FINAL_STATUS_MANAGER_SHUTDOWN);
+
+  // Prefetching again before time_to_live aborts, because it is a duplicate.
+  tick_clock->Advance(kTestAdvance);
+  EXPECT_FALSE(
+      prerender_manager()->AddPrerenderFromOmnibox(kUrl, nullptr, gfx::Size()));
+
+  // Prefetching after time_to_live succeeds.
+  tick_clock->Advance(prerender_manager()->config().time_to_live);
+  EXPECT_TRUE(
+      prerender_manager()->AddPrerenderFromOmnibox(kUrl, nullptr, gfx::Size()));
+}
 
 // Make sure that if we prerender more requests than we support, that we launch
 // them in the order given up until we reach MaxConcurrency, at which point we