Add an IO thread index bitmap to disk cache.

net/disk_cache/in_flight_io.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/disk_cache/in_flight_io.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/threading/thread_restrictions.h"
@@ skipping 30 matching lines @@
 InFlightIO::~InFlightIO() {
 }
 
 // Runs on the background thread.
 void BackgroundIO::NotifyController() {
   base::AutoLock lock(controller_lock_);
   if (controller_)
     controller_->OnIOComplete(this);
 }
 
+scoped_refptr<base::MessageLoopProxy> BackgroundIO::GetCallbackThread() {
+  base::AutoLock lock(controller_lock_);
+  if (!controller_)
+    return NULL;
+  return controller_->callback_thread();
+}
+
 void InFlightIO::WaitForPendingIO() {
   while (!io_list_.empty()) {
     // Block the current thread until all pending IO completes.
     IOList::iterator it = io_list_.begin();
     InvokeCallback(*it, true);
   }
 }
 
 void InFlightIO::DropPendingIO() {
   while (!io_list_.empty()) {
@@ skipping 40 matching lines @@
   OnOperationComplete(operation, cancel_task);
 }
 
 // Runs on the primary thread.
 void InFlightIO::OnOperationPosted(BackgroundIO* operation) {
   DCHECK(callback_thread_->BelongsToCurrentThread());
   io_list_.insert(make_scoped_refptr(operation));
 }
 
 }  // namespace disk_cache