Pass DomContentLoaded event from prerenders to launching elements.

chrome/browser/prerender/prerender_handle.h

Index: chrome/browser/prerender/prerender_handle.h
diff --git a/chrome/browser/prerender/prerender_handle.h b/chrome/browser/prerender/prerender_handle.h
index a9b2f01aef2fc06e1a881bd8e1eecbc3b9c0b948..1b3299dc707520879dc57d46e4dc5517405f17dd 100644
--- a/chrome/browser/prerender/prerender_handle.h
+++ b/chrome/browser/prerender/prerender_handle.h
@@ -38,6 +38,9 @@ class PrerenderHandle : public base::NonThreadSafe,
     // Signals that the prerender has had its load event.
     virtual void OnPrerenderStopLoading(PrerenderHandle* handle) = 0;
 
+    // Signals that the prerender has had its 'DOMContentLoaded' event.
+    virtual void OnPrerenderDomContentLoaded(PrerenderHandle* handle) = 0;
+
     // Signals that the prerender has stopped running.
     virtual void OnPrerenderStop(PrerenderHandle* handle) = 0;
 
@@ -102,6 +105,8 @@ class PrerenderHandle : public base::NonThreadSafe,
   virtual void OnPrerenderStart(PrerenderContents* prerender_contents) OVERRIDE;
   virtual void OnPrerenderStopLoading(PrerenderContents* prerender_contents)
       OVERRIDE;
+  virtual void OnPrerenderDomContentLoaded(
+      PrerenderContents* prerender_contents) OVERRIDE;
   virtual void OnPrerenderStop(PrerenderContents* prerender_contents) OVERRIDE;
   virtual void OnPrerenderCreatedMatchCompleteReplacement(
       PrerenderContents* contents, PrerenderContents* replacement) OVERRIDE;