net: Make UploadData::GetContentLength() asynchronous.

content/browser/renderer_host/resource_dispatcher_host.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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "content/browser/renderer_host/resource_dispatcher_host.h"
 
 #include <set>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/debug/alias.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/shared_memory.h"
 #include "base/stl_util.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
+#include "base/threading/thread_restrictions.h"
 #include "content/browser/appcache/chrome_appcache_service.h"
 #include "content/browser/cert_store.h"
 #include "content/browser/child_process_security_policy_impl.h"
 #include "content/browser/chrome_blob_storage_context.h"
 #include "content/browser/cross_site_request_manager.h"
 #include "content/browser/download/download_file_manager.h"
 #include "content/browser/download/download_resource_handler.h"
 #include "content/browser/download/save_file_manager.h"
 #include "content/browser/download/save_file_resource_handler.h"
 #include "content/browser/plugin_service_impl.h"
@@ skipping 606 matching lines @@
 
   request->set_context(
       filter_->GetURLRequestContext(request_data.resource_type));
   request->set_priority(DetermineRequestPriority(request_data.resource_type));
 
   // Set upload data.
   uint64 upload_size = 0;
   if (request_data.upload_data) {
     request->set_upload(request_data.upload_data);
     // This results in performing file IO. crbug.com/112607.
-    upload_size = request_data.upload_data->GetContentLength();
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
+    upload_size = request_data.upload_data->GetContentLengthSync();
   }
 
   // Install a CrossSiteResourceHandler if this request is coming from a
   // RenderViewHost with a pending cross-site request.  We only check this for
   // MAIN_FRAME requests. Unblock requests only come from a blocked page, do
   // not count as cross-site, otherwise it gets blocked indefinitely.
   if (request_data.resource_type == ResourceType::MAIN_FRAME &&
       process_type == content::PROCESS_TYPE_RENDERER &&
       CrossSiteRequestManager::GetInstance()->
           HasPendingCrossSiteRequest(child_id, route_id)) {
@@ skipping 1639 matching lines @@
   scoped_refptr<ResourceHandler> transferred_resource_handler(
       new DoomedResourceHandler(info->resource_handler()));
   info->set_resource_handler(transferred_resource_handler.get());
 }
 
 bool ResourceDispatcherHost::IsTransferredNavigation(
     const content::GlobalRequestID& transferred_request_id) const {
   return transferred_navigations_.find(transferred_request_id) !=
       transferred_navigations_.end();
 }