Seculative resource prefetching for URLs CL.

chrome/browser/net/chrome_network_delegate.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/browser/net/chrome_network_delegate.h"
 
 #include "base/logging.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/content_settings/cookie_settings.h"
 #include "chrome/browser/content_settings/tab_specific_content_settings.h"
 #include "chrome/browser/custom_handlers/protocol_handler_registry.h"
 #include "chrome/browser/extensions/api/proxy/proxy_api.h"
 #include "chrome/browser/extensions/api/web_request/web_request_api.h"
 #include "chrome/browser/extensions/extension_event_router_forwarder.h"
 #include "chrome/browser/extensions/extension_info_map.h"
 #include "chrome/browser/extensions/extension_process_manager.h"
+#include "chrome/browser/net/resource_prefetch_predictor_observer.h"
+#include "chrome/browser/predictors/resource_prefetch_predictor.h"
 #include "chrome/browser/prefs/pref_member.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/task_manager/task_manager.h"
 #include "chrome/common/pref_names.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/resource_request_info.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_log.h"
@@ skipping 89 matching lines @@
 }
 
 }  // namespace
 
 ChromeNetworkDelegate::ChromeNetworkDelegate(
     ExtensionEventRouterForwarder* event_router,
     ExtensionInfoMap* extension_info_map,
     const policy::URLBlacklistManager* url_blacklist_manager,
     void* profile,
     CookieSettings* cookie_settings,
+    scoped_refptr<predictors::ResourcePrefetchPredictor>
+        resource_prefetch_predictor,
     BooleanPrefMember* enable_referrers)
     : event_router_(event_router),
       profile_(profile),
       cookie_settings_(cookie_settings),
       extension_info_map_(extension_info_map),
       enable_referrers_(enable_referrers),
       url_blacklist_manager_(url_blacklist_manager) {
   DCHECK(event_router);
   DCHECK(enable_referrers);
   DCHECK(!profile || cookie_settings);
+
+  if (resource_prefetch_predictor)
+    resource_prefetch_predictor_observer_.reset(
+        new chrome_browser_net::ResourcePrefetchPredictorObserver(
+            resource_prefetch_predictor));
 }
 
 ChromeNetworkDelegate::~ChromeNetworkDelegate() {}
 
 // static
 void ChromeNetworkDelegate::InitializeReferrersEnabled(
     BooleanPrefMember* enable_referrers,
     PrefService* pref_service) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   enable_referrers->Init(prefs::kEnableReferrers, pref_service, NULL);
@@ skipping 19 matching lines @@
     scoped_refptr<net::NetLog::EventParameters> params;
     params = new net::NetLogStringParameter("url", request->url().spec());
     request->net_log().AddEvent(
         net::NetLog::TYPE_CHROME_POLICY_ABORTED_REQUEST, params);
     return net::ERR_NETWORK_ACCESS_DENIED;
   }
 #endif
 
   ForwardRequestStatus(REQUEST_STARTED, request, profile_);
 
+  if (resource_prefetch_predictor_observer_.get())

[dominich, 2012/05/24 16:07:53]

Is there a way to create a ProfileKeyedService on IO? If so, having the
RPPObserver be created that way would clarify ownership. 

[Shishir, 2012/05/30 01:07:51]

The ProfileKeyedServices are all created together on the UI thread when the
prefs are loaded and there doesnt seem to be a way of creating one separately on
IO.

Please look at the new ownership. Much clearer now.

+    resource_prefetch_predictor_observer_->OnBeforeURLRequest(request);
+
   if (!enable_referrers_->GetValue())
     request->set_referrer(std::string());
   return ExtensionWebRequestEventRouter::GetInstance()->OnBeforeRequest(
       profile_, extension_info_map_.get(), request, callback, new_url);
 }
 
 int ChromeNetworkDelegate::OnBeforeSendHeaders(
     net::URLRequest* request,
     const net::CompletionCallback& callback,
     net::HttpRequestHeaders* headers) {
@@ skipping 15 matching lines @@
     scoped_refptr<net::HttpResponseHeaders>* override_response_headers) {
   return ExtensionWebRequestEventRouter::GetInstance()->OnHeadersReceived(
       profile_, extension_info_map_.get(), request, callback,
       original_response_headers, override_response_headers);
 }
 
 void ChromeNetworkDelegate::OnBeforeRedirect(net::URLRequest* request,
                                              const GURL& new_location) {
   ExtensionWebRequestEventRouter::GetInstance()->OnBeforeRedirect(
       profile_, extension_info_map_.get(), request, new_location);
+  if (resource_prefetch_predictor_observer_.get())
+    resource_prefetch_predictor_observer_->OnBeforeRedirect(request);
 }
 
 
 void ChromeNetworkDelegate::OnResponseStarted(net::URLRequest* request) {
   ExtensionWebRequestEventRouter::GetInstance()->OnResponseStarted(
       profile_, extension_info_map_.get(), request);
   ForwardProxyErrors(request, event_router_.get(), profile_);
+  if (resource_prefetch_predictor_observer_.get())
+    resource_prefetch_predictor_observer_->OnResponseStarted(request);
 }
 
 void ChromeNetworkDelegate::OnRawBytesRead(const net::URLRequest& request,
                                            int bytes_read) {
 #if defined(ENABLE_TASK_MANAGER)
   TaskManager::GetInstance()->model()->NotifyBytesRead(request, bytes_read);
 #endif  // defined(ENABLE_TASK_MANAGER)
 }
 
 void ChromeNetworkDelegate::OnCompleted(net::URLRequest* request,
@@ skipping 123 matching lines @@
     if (white_listed_path == path.StripTrailingSeparators() ||
         white_listed_path.IsParent(path)) {
       return true;
     }
   }
   return false;
 #else
   return true;
 #endif  // defined(OS_CHROMEOS)
 }