Make TaskManagerTabContentsResource explicitly handle prerendering and instant pages.

chrome/browser/prerender/prerender_manager.cc

Index: chrome/browser/prerender/prerender_manager.cc
diff --git a/chrome/browser/prerender/prerender_manager.cc b/chrome/browser/prerender/prerender_manager.cc
index 4adfca282a57de6265e725bd2b02003ecb4798c8..1cab97eed6ea7bf58e906bf79d7cfe39892a9370 100644
--- a/chrome/browser/prerender/prerender_manager.cc
+++ b/chrome/browser/prerender/prerender_manager.cc
@@ -685,6 +685,21 @@ PrerenderContents* PrerenderManager::GetPrerenderContents(
   return NULL;
 }
 
+const std::vector<WebContents*>
+PrerenderManager::GetAllPrerenderingContents() const {
+  DCHECK(CalledOnValidThread());
+  std::vector<WebContents*> result;
+
+  for (ScopedVector<PrerenderData>::const_iterator it =
+           active_prerenders_.begin();
+       it != active_prerenders_.end(); ++it) {
+    if (TabContents* contents = (*it)->contents()->prerender_contents())
+      result.push_back(contents->web_contents());
+  }
+
+  return result;
+}
+
 void PrerenderManager::MarkWebContentsAsPrerendered(WebContents* web_contents,
                                                     Origin origin) {
   DCHECK(CalledOnValidThread());