Pass DomContentLoaded event from prerenders to launching elements.

chrome/browser/prerender/prerender_browsertest.cc

Index: chrome/browser/prerender/prerender_browsertest.cc
diff --git a/chrome/browser/prerender/prerender_browsertest.cc b/chrome/browser/prerender/prerender_browsertest.cc
index 2293e40390bcd306b30813b5c726dcc2a1d28c6e..a093086e9fd615a524f9ad81560287f72f8e82b7 100644
--- a/chrome/browser/prerender/prerender_browsertest.cc
+++ b/chrome/browser/prerender/prerender_browsertest.cc
@@ -1298,6 +1298,19 @@ class PrerenderBrowserTest : virtual public InProcessBrowserTest {
     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(
@@ -1523,6 +1536,8 @@ class PrerenderBrowserTest : virtual public InProcessBrowserTest {
     if (check_load_events_) {
       EXPECT_EQ(expected_number_of_loads, prerenders[0]->number_of_loads());
       EXPECT_EQ(expected_number_of_loads,
+                GetPrerenderDomContentLoadedEventCountForLinkNumber(0));
+      EXPECT_EQ(expected_number_of_loads,
                 GetPrerenderLoadEventCountForLinkNumber(0));
     }
     EXPECT_FALSE(HadPrerenderEventErrors());