Handle extension webrequest API on the IO thread. This speeds up blocking event

chrome/browser/net/chrome_network_delegate.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/net/chrome_network_delegate.h"
 
 #include "base/logging.h"
 #include "chrome/browser/custom_handlers/protocol_handler_registry.h"
 #include "chrome/browser/extensions/extension_event_router_forwarder.h"
+#include "chrome/browser/extensions/extension_info_map.h"
 #include "chrome/browser/extensions/extension_proxy_api.h"
 #include "chrome/browser/extensions/extension_webrequest_api.h"
 #include "chrome/browser/prefs/pref_member.h"
 #include "chrome/browser/task_manager/task_manager.h"
 #include "chrome/common/pref_names.h"
 #include "content/browser/browser_thread.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/net_errors.h"
 #include "net/http/http_request_headers.h"
 #include "net/http/http_response_headers.h"
@@ skipping 14 matching lines @@
         ExtensionProxyEventRouter::GetInstance()->OnProxyError(
             event_router, profile_id, request->status().os_error());
     }
   }
 }
 
 }  // namespace
 
 ChromeNetworkDelegate::ChromeNetworkDelegate(
     ExtensionEventRouterForwarder* event_router,
+    ExtensionInfoMap* extension_info_map,
     ProfileId profile_id,
     BooleanPrefMember* enable_referrers)
     : event_router_(event_router),
       profile_id_(profile_id),
+      extension_info_map_(extension_info_map),
       enable_referrers_(enable_referrers) {
   DCHECK(event_router);
   DCHECK(enable_referrers);
 }
 
 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);
   enable_referrers->MoveToThread(BrowserThread::IO);
 }
 
 int ChromeNetworkDelegate::OnBeforeURLRequest(
     net::URLRequest* request,
     net::CompletionCallback* callback,
     GURL* new_url) {
   if (!enable_referrers_->GetValue())
     request->set_referrer(std::string());
   return ExtensionWebRequestEventRouter::GetInstance()->OnBeforeRequest(
-      profile_id_, event_router_.get(), request, callback, new_url);
+      profile_id_, extension_info_map_.get(), request, callback, new_url);
 }
 
 int ChromeNetworkDelegate::OnBeforeSendHeaders(
     uint64 request_id,
     net::CompletionCallback* callback,
     net::HttpRequestHeaders* headers) {
   return ExtensionWebRequestEventRouter::GetInstance()->OnBeforeSendHeaders(
-      profile_id_, event_router_.get(), request_id, callback, headers);
+      profile_id_, extension_info_map_.get(), request_id, callback, headers);
 }
 
 void ChromeNetworkDelegate::OnRequestSent(
     uint64 request_id,
     const net::HostPortPair& socket_address,
     const net::HttpRequestHeaders& headers) {
   ExtensionWebRequestEventRouter::GetInstance()->OnRequestSent(
-      profile_id_, event_router_.get(), request_id, socket_address, headers);
+      profile_id_, extension_info_map_.get(), request_id,
+      socket_address, headers);
 }
 
 void ChromeNetworkDelegate::OnBeforeRedirect(net::URLRequest* request,
                                              const GURL& new_location) {
   ExtensionWebRequestEventRouter::GetInstance()->OnBeforeRedirect(
-      profile_id_, event_router_.get(), request, new_location);
+      profile_id_, extension_info_map_.get(), request, new_location);
 }
 
 
 void ChromeNetworkDelegate::OnResponseStarted(net::URLRequest* request) {
   ExtensionWebRequestEventRouter::GetInstance()->OnResponseStarted(
-      profile_id_, event_router_.get(), request);
+      profile_id_, extension_info_map_.get(), request);
   ForwardProxyErrors(request, event_router_.get(), profile_id_);
 }
 
 void ChromeNetworkDelegate::OnRawBytesRead(const net::URLRequest& request,
                                            int bytes_read) {
   TaskManager::GetInstance()->model()->NotifyBytesRead(request, bytes_read);
 }
 
 void ChromeNetworkDelegate::OnCompleted(net::URLRequest* request) {
   if (request->status().status() == net::URLRequestStatus::SUCCESS) {
     bool is_redirect = request->response_headers() &&
         net::HttpResponseHeaders::IsRedirectResponseCode(
             request->response_headers()->response_code());
     if (!is_redirect) {
       ExtensionWebRequestEventRouter::GetInstance()->OnCompleted(
-          profile_id_, event_router_.get(), request);
+          profile_id_, extension_info_map_.get(), request);
     }
   } else if (request->status().status() == net::URLRequestStatus::FAILED) {
     ExtensionWebRequestEventRouter::GetInstance()->OnErrorOccurred(
-            profile_id_, event_router_.get(), request);
+            profile_id_, extension_info_map_.get(), request);
   }
   ForwardProxyErrors(request, event_router_.get(), profile_id_);
 }
 
 void ChromeNetworkDelegate::OnURLRequestDestroyed(net::URLRequest* request) {
   ExtensionWebRequestEventRouter::GetInstance()->OnURLRequestDestroyed(
       profile_id_, request);
 }
 
 void ChromeNetworkDelegate::OnHttpTransactionDestroyed(uint64 request_id) {
   ExtensionWebRequestEventRouter::GetInstance()->OnHttpTransactionDestroyed(
       profile_id_, request_id);
 }
 
 void ChromeNetworkDelegate::OnPACScriptError(int line_number,
                                              const string16& error) {
   ExtensionProxyEventRouter::GetInstance()->OnPACScriptError(
       event_router_.get(), profile_id_, line_number, error);
 }