net: Make UploadDataStream::Init() asynchronous.

net/http/http_network_transaction.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 "net/http/http_network_transaction.h"
 
 #include <set>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/compiler_specific.h"
 #include "base/format_macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/stats_counters.h"
 #include "base/stl_util.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
+#include "base/threading/thread_restrictions.h"
 #include "build/build_config.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/auth.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/io_buffer.h"
 #include "net/base/load_flags.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_util.h"
 #include "net/base/ssl_cert_request_info.h"
 #include "net/base/ssl_connection_status_flags.h"
@@ skipping 694 matching lines @@
         &request_headers_);
 
   request_headers_.MergeFrom(request_->extra_headers);
 }
 
 int HttpNetworkTransaction::DoBuildRequest() {
   next_state_ = STATE_BUILD_REQUEST_COMPLETE;
   request_body_.reset(NULL);
   if (request_->upload_data) {
     request_body_.reset(new UploadDataStream(request_->upload_data));
-    const int error_code = request_body_->Init();
+    // InitSync() performs file IO. crbug.com/113669.
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
+    const int error_code = request_body_->InitSync();
     if (error_code != OK) {
       request_body_.reset(NULL);
       return error_code;
     }
   }
 
   headers_valid_ = false;
 
   // This is constructed lazily (instead of within our Start method), so that
   // we have proxy info available.
@@ skipping 605 matching lines @@
       description = base::StringPrintf("Unknown state 0x%08X (%u)", state,
                                        state);
       break;
   }
   return description;
 }
 
 #undef STATE_CASE
 
 }  // namespace net