[NoStatePrefetch] Do not send responses to renderer in prefetch mode.

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 <memory>
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/debug/crash_logging.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/user_metrics_action.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "build/build_config.h"
 #include "chrome/common/channel_info.h"
 #include "chrome/common/chrome_features.h"
 #include "chrome/common/chrome_isolated_world_ids.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/crash_keys.h"
 #include "chrome/common/pepper_permission_util.h"
+#include "chrome/common/prerender_types.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/secure_origin_whitelist.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/generated_resources.h"
 #include "chrome/grit/locale_settings.h"
 #include "chrome/grit/renderer_resources.h"
 #include "chrome/renderer/app_categorizer.h"
 #include "chrome/renderer/banners/app_banner_client.h"
 #include "chrome/renderer/benchmarking_extension.h"
 #include "chrome/renderer/chrome_render_frame_observer.h"
@@ skipping 1099 matching lines @@
     else if (url.host() == chrome::kChromeUIThumbnailHost)
       type = SearchBox::THUMB;
 
     if (type != SearchBox::NONE)
       return search_box->GenerateImageURLFromTransientURL(url, type, new_url);
   }
 
   return false;
 }
 
+bool ChromeContentRendererClient::IsPrefetchOnly(
+    content::RenderFrame* render_frame,
+    const blink::WebURLRequest& request) {
+  return prerender::PrerenderHelper::GetPrerenderMode(render_frame) ==
+         prerender::PREFETCH_ONLY;
+}
+
 unsigned long long ChromeContentRendererClient::VisitedLinkHash(
     const char* canonical_url, size_t length) {
   return visited_link_slave_->ComputeURLFingerprint(canonical_url, length);
 }
 
 bool ChromeContentRendererClient::IsLinkVisited(unsigned long long link_hash) {
   return visited_link_slave_->IsVisited(link_hash);
 }
 
 blink::WebPrescientNetworking*
@@ skipping 306 matching lines @@
 
   url::Replacements<char> r;
   r.SetPath(path.c_str(), url::Component(0, path.length()));
 
   if (result == internal::NUM_PLUGIN_ERROR)
     result = invalid_url ? internal::SUCCESS_PARAMS_REWRITE : internal::SUCCESS;
 
   RecordYouTubeRewriteUMA(result);
   return corrected_url.ReplaceComponents(r);
 }