Offload disk accesses to WorkerPool in ExtensionProtocolHandler

net/url_request/url_request_simple_job.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/url_request/url_request_simple_job.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/message_loop.h"
 #include "net/base/io_buffer.h"
@@ skipping 39 matching lines @@
   memcpy(buf->data(), data_.data() + data_offset_, buf_size);
   data_offset_ += buf_size;
   *bytes_read = buf_size;
   return true;
 }
 
 void URLRequestSimpleJob::StartAsync() {
   if (!request_)
     return;
 
-  if (GetData(&mime_type_, &charset_, &data_)) {
+  int result = GetData(&mime_type_, &charset_, &data_,
+                       base::Bind(&URLRequestSimpleJob::OnGetDataCompleted,
+                                  weak_factory_.GetWeakPtr()));
+  if (result != ERR_IO_PENDING)
+    OnGetDataCompleted(result);
+}
+
+void URLRequestSimpleJob::OnGetDataCompleted(int result) {
+  if (result == OK) {
     // Notify that the headers are complete
     NotifyHeadersComplete();
   } else {
     // what should the error code be?

[wtc, 2012/07/11 01:08:46]

Nit: add
    DCHECK_EQ(result, ERR_FAILED);

     NotifyStartError(URLRequestStatus(URLRequestStatus::FAILED,
                                       ERR_INVALID_URL));
   }
 }
 
 }  // namespace net