Pass DomContentLoaded event from prerenders to launching elements.

chrome/browser/prerender/prerender_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 <deque>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 1291 matching lines @@
         "window.domAutomationController.send("
             "receivedPrerenderLoadEvents[%d] || 0)", index);
 
     CHECK(content::ExecuteScriptAndExtractInt(
         GetActiveWebContents(),
         expression,
         &load_event_count));
     return load_event_count;
   }
 
+  int GetPrerenderDomContentLoadedEventCountForLinkNumber(int index) const {
+    int dom_content_loaded_event_count;
+    std::string expression = base::StringPrintf(
+        "window.domAutomationController.send("
+            "receivedPrerenderDomContentLoadedEvents[%d] || 0)", index);
+
+    CHECK(content::ExecuteScriptAndExtractInt(
+        GetActiveWebContents(),
+        expression,
+        &dom_content_loaded_event_count));
+    return dom_content_loaded_event_count;
+  }
+
   bool DidReceivePrerenderStopEventForLinkNumber(int index) const {
     bool received_prerender_stopped;
     std::string expression = base::StringPrintf(
         "window.domAutomationController.send(Boolean("
             "receivedPrerenderStopEvents[%d]))", index);
 
     CHECK(content::ExecuteScriptAndExtractBool(
         GetActiveWebContents(),
         expression,
         &received_prerender_stopped));
@@ skipping 289 matching lines @@
   Browser* explicitly_set_browser_;
 };
 
 // Checks that a page is correctly prerendered in the case of a
 // <link rel=prerender> tag and then loaded into a tab in response to a
 // navigation.
 IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, PrerenderPage) {
   UMAHistogramHelper histograms;
 
   PrerenderTestURL("files/prerender/prerender_page.html", FINAL_STATUS_USED, 1);
+  EXPECT_EQ(GetPrerenderDomContentLoadedEventCountForLinkNumber(0), 1);

[davidben, 2014/02/11 20:18:40]

Nit: EXPECT_EQ(1, GetPrerenderblah). The first argument is the expected value,
the second is the actual. (They display differently in the case of failures.)

[ksimbili, 2014/02/11 21:16:58]

Done.

   histograms.Fetch();
   histograms.ExpectTotalCount("Prerender.none_PerceivedPLT", 1);
   histograms.ExpectTotalCount("Prerender.none_PerceivedPLTMatched", 0);
   histograms.ExpectTotalCount("Prerender.none_PerceivedPLTMatchedComplete", 0);
   histograms.ExpectTotalCount("Prerender.websame_PrerenderNotSwappedInPLT", 1);
 
   ChannelDestructionWatcher channel_close_watcher;
   channel_close_watcher.WatchChannel(
       GetActiveWebContents()->GetRenderProcessHost());
   NavigateToDestURL();
@@ skipping 2021 matching lines @@
   DisableJavascriptCalls();
   UMAHistogramHelper histograms;
 
   // The prerender will not completely load until after the swap, so wait for a
   // title change before calling DidPrerenderPass.
   scoped_ptr<TestPrerender> prerender =
       PrerenderTestURL(
           "files/prerender/prerender_deferred_image.html",
           FINAL_STATUS_USED, 0);
   WaitForASCIITitle(prerender->contents()->prerender_contents(), kReadyTitle);
+  EXPECT_EQ(GetPrerenderDomContentLoadedEventCountForLinkNumber(0), 1);

[davidben, 2014/02/11 20:18:40]

Nit: Ditto.

[ksimbili, 2014/02/11 21:16:58]

Done.

   EXPECT_TRUE(DidPrerenderPass(prerender->contents()->prerender_contents()));
   EXPECT_EQ(0, prerender->number_of_loads());
   histograms.Fetch();
   histograms.ExpectTotalCount("Prerender.none_PerceivedPLT", 1);
   histograms.ExpectTotalCount("Prerender.none_PerceivedPLTMatched", 0);
   histograms.ExpectTotalCount("Prerender.none_PerceivedPLTMatchedComplete", 0);
   histograms.ExpectTotalCount("Prerender.websame_PrerenderNotSwappedInPLT", 0);
 
   // Swap.
   NavigationOrSwapObserver swap_observer(current_browser()->tab_strip_model(),
@@ skipping 375 matching lines @@
   }
 };
 
 // Checks that prerendering works in incognito mode.
 IN_PROC_BROWSER_TEST_F(PrerenderIncognitoBrowserTest, PrerenderIncognito) {
   PrerenderTestURL("files/prerender/prerender_page.html", FINAL_STATUS_USED, 1);
   NavigateToDestURL();
 }
 
 }  // namespace prerender