net: Make UploadData::GetContentLength() asynchronous.

webkit/tools/test_shell/simple_resource_loader_bridge.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.
 //
 // This file contains an implementation of the ResourceLoaderBridge class.
 // The class is implemented using net::URLRequest, meaning it is a "simple"
 // version that directly issues requests. The more complicated one used in the
 // browser uses IPC.
 //
 // Because net::URLRequest only provides an asynchronous resource loading API,
@@ skipping 516 matching lines @@
   // Called on the IO thread.
   void MaybeUpdateUploadProgress() {
     // If a redirect is received upload is cancelled in net::URLRequest, we
     // should try to stop the |upload_progress_timer_| timer and return.
     if (!request_->has_upload()) {
       if (upload_progress_timer_.IsRunning())
         upload_progress_timer_.Stop();
       return;
     }
 
-    uint64 size = request_->get_upload()->GetContentLength();
+    // GetContentLengthSync() may perform file IO, but it's ok here, as file
+    // IO is not prohibited in IOThread defined in the file.
+    uint64 size = request_->get_upload()->GetContentLengthSync();
     uint64 position = request_->GetUploadProgress();
     if (position == last_upload_position_)
       return;  // no progress made since last time
 
     const uint64 kHalfPercentIncrements = 200;
     const base::TimeDelta kOneSecond = base::TimeDelta::FromMilliseconds(1000);
 
     uint64 amt_since_last = position - last_upload_position_;
     base::TimeDelta time_since_last = base::TimeTicks::Now() -
                                       last_upload_ticks_;
@@ skipping 485 matching lines @@
          (http_prefix.SchemeIs("http") || http_prefix.SchemeIs("https")));
   g_file_over_http_params = new FileOverHTTPParams(file_path_template,
                                                    http_prefix);
 }
 
 // static
 webkit_glue::ResourceLoaderBridge* SimpleResourceLoaderBridge::Create(
     const webkit_glue::ResourceLoaderBridge::RequestInfo& request_info) {
   return new ResourceLoaderBridgeImpl(request_info);
 }