Enable resource prefetch from the browser process.

chrome/renderer/chrome_content_renderer_client.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 "chrome/renderer/chrome_content_renderer_client.h"
 
 #include "base/command_line.h"
 #include "base/debug/crash_logging.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
@@ skipping 33 matching lines @@
 #include "chrome/renderer/net/net_error_helper.h"
 #include "chrome/renderer/net/prescient_networking_dispatcher.h"
 #include "chrome/renderer/net/renderer_net_predictor.h"
 #include "chrome/renderer/net_benchmarking_extension.h"
 #include "chrome/renderer/page_load_histograms.h"
 #include "chrome/renderer/pepper/pepper_helper.h"
 #include "chrome/renderer/pepper/ppb_pdf_impl.h"
 #include "chrome/renderer/playback_extension.h"
 #include "chrome/renderer/plugins/chrome_plugin_placeholder.h"
 #include "chrome/renderer/plugins/plugin_uma.h"
+#include "chrome/renderer/prefetch_helper.h"
 #include "chrome/renderer/prerender/prerender_dispatcher.h"
 #include "chrome/renderer/prerender/prerender_helper.h"
 #include "chrome/renderer/prerender/prerender_media_load_deferrer.h"
 #include "chrome/renderer/prerender/prerenderer_client.h"
 #include "chrome/renderer/principals_extension_bindings.h"
 #include "chrome/renderer/printing/print_web_view_helper.h"
 #include "chrome/renderer/safe_browsing/malware_dom_details.h"
 #include "chrome/renderer/safe_browsing/phishing_classifier_delegate.h"
 #include "chrome/renderer/searchbox/search_bouncer.h"
 #include "chrome/renderer/searchbox/searchbox.h"
@@ skipping 355 matching lines @@
     // they're prerendering.
     if (prerender::PrerenderHelper::IsPrerendering(
             render_frame->GetRenderView()->GetMainRenderFrame())) {
       new prerender::PrerenderHelper(render_frame);
     }
   }
 
   if (render_frame->GetRenderView()->GetMainRenderFrame() == render_frame) {
     // Only attach NetErrorHelper to the main frame, since only the main frame
     // should get error pages.
+    // PrefetchHelper is also needed only for main frames.
     new NetErrorHelper(render_frame);
+    new prefetch::PrefetchHelper(render_frame);
   }
 }
 
 void ChromeContentRendererClient::RenderViewCreated(
     content::RenderView* render_view) {
   new extensions::ExtensionHelper(render_view, extension_dispatcher_.get());
   new extensions::ChromeExtensionHelper(render_view);
   new PageLoadHistograms(render_view);
 #if defined(ENABLE_PRINTING)
   new printing::PrintWebViewHelper(render_view);
@@ skipping 1018 matching lines @@
   CommandLine* command_line = CommandLine::ForCurrentProcess();
   return !command_line->HasSwitch(extensions::switches::kExtensionProcess);
 }
 
 blink::WebWorkerPermissionClientProxy*
 ChromeContentRendererClient::CreateWorkerPermissionClientProxy(
     content::RenderFrame* render_frame,
     blink::WebFrame* frame) {
   return new WorkerPermissionClientProxy(render_frame, frame);
 }