Give prerendering RVH's RenderWidgetHostViews.

chrome/browser/prerender/prerender_manager.cc

 // Copyright (c) 2011 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 "chrome/browser/prerender/prerender_manager.h"
 
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/time.h"
@@ skipping 116 matching lines @@
     data.contents_->set_final_status(FINAL_STATUS_MANAGER_SHUTDOWN);
     delete data.contents_;
   }
 }
 
 void PrerenderManager::SetPrerenderContentsFactory(
     PrerenderContents::Factory* prerender_contents_factory) {
   prerender_contents_factory_.reset(prerender_contents_factory);
 }
 
-bool PrerenderManager::AddPreload(const GURL& url,
-                                  const std::vector<GURL>& alias_urls,
-                                  const GURL& referrer) {
+bool PrerenderManager::AddPreload(
+    const std::pair<int, int>& child_route_id_pair,
+    const GURL& url,
+    const std::vector<GURL>& alias_urls,
+    const GURL& referrer) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DeleteOldEntries();
   if (FindEntry(url))
     return false;
 
   // Local copy, since we may have to add an additional entry to it.
   std::vector<GURL> all_alias_urls = alias_urls;
 
   GURL additional_alias_url;
   if (IsControlGroup() &&
@@ skipping 20 matching lines @@
   // Check if enough time has passed since the last prerender.
   if (!DoesRateLimitAllowPrerender()) {
     // Cancel the prerender. We could add it to the pending prerender list but
     // this doesn't make sense as the next prerender request will be triggered
     // by a navigation and is unlikely to be the same site.
     RecordFinalStatus(FINAL_STATUS_RATE_LIMIT_EXCEEDED);
 
     return false;
   }
 
+  RenderViewHost* source_render_view_host = NULL;
+  // This test should fail only during unit tests.
+  if (child_route_id_pair.first != -1) {
+    source_render_view_host =
+        RenderViewHost::FromID(child_route_id_pair.first,
+                               child_route_id_pair.second);
+    // Don't prerender page if parent RenderViewHost no longer exists, or it has
+    // no view.  The latter should only happen when the RenderView has closed.
+    if (!source_render_view_host || !source_render_view_host->view()) {
+      RecordFinalStatus(FINAL_STATUS_SOURCE_RENDER_VIEW_CLOSED);
+      return false;
+    }
+  }
+
   // TODO(cbentzel): Move invalid checks here instead of PrerenderContents?
   PrerenderContentsData data(CreatePrerenderContents(url, all_alias_urls,
                                                      referrer),
                              GetCurrentTime());
 
   prerender_list_.push_back(data);
   if (IsControlGroup()) {
     data.contents_->set_final_status(FINAL_STATUS_CONTROL_GROUP);
   } else {
     last_prerender_start_time_ = GetCurrentTimeTicks();
-    data.contents_->StartPrerendering();
+    data.contents_->StartPrerendering(source_render_view_host);
   }
   while (prerender_list_.size() > max_elements_) {
     data = prerender_list_.front();
     prerender_list_.pop_front();
     data.contents_->set_final_status(FINAL_STATUS_EVICTED);
     delete data.contents_;
   }
   StartSchedulingPeriodicCleanups();
   return true;
 }
 
 void PrerenderManager::AddPendingPreload(
-    const std::pair<int,int>& child_route_id_pair,
+    const std::pair<int, int>& child_route_id_pair,
     const GURL& url,
     const std::vector<GURL>& alias_urls,
     const GURL& referrer) {
   // Check if this is coming from a valid prerender rvh.
   bool is_valid_prerender = false;
   for (std::list<PrerenderContentsData>::iterator it = prerender_list_.begin();
        it != prerender_list_.end(); ++it) {
     PrerenderContents* pc = it->contents_;
 
     int child_id;
@@ skipping 96 matching lines @@
 
   // See if we have any pending prerender requests for this routing id and start
   // the preload if we do.
   std::pair<int, int> child_route_pair = std::make_pair(child_id, route_id);
   PendingPrerenderList::iterator pending_it =
       pending_prerender_list_.find(child_route_pair);
   if (pending_it != pending_prerender_list_.end()) {
     for (std::vector<PendingContentsData>::iterator content_it =
             pending_it->second.begin();
          content_it != pending_it->second.end(); ++content_it) {
-      AddPreload(content_it->url_, content_it->alias_urls_,
+      AddPreload(pending_it->first, content_it->url_, content_it->alias_urls_,
                  content_it->referrer_);
     }
     pending_prerender_list_.erase(pending_it);
   }
 
   NotificationService::current()->Notify(
       NotificationType::PRERENDER_CONTENTS_USED,
       Source<std::pair<int, int> >(&child_route_pair),
       NotificationService::NoDetails());
 
@@ skipping 246 matching lines @@
 
 bool PrerenderManager::IsTabContentsPrerendered(TabContents* tc) const {
   return prerendered_tc_set_.count(tc) > 0;
 }
 
 bool PrerenderManager::WouldTabContentsBePrerendered(TabContents* tc) const {
   return would_be_prerendered_tc_set_.count(tc) > 0;
 }
 
 }  // namespace prerender