Create a secondary file thread, FILE_USER_BLOCKING...

chrome/browser/browser_process_impl.cc

Index: chrome/browser/browser_process_impl.cc
===================================================================
--- chrome/browser/browser_process_impl.cc	(revision 106339)
+++ chrome/browser/browser_process_impl.cc	(working copy)
@@ -137,6 +137,7 @@
       created_db_thread_(false),
       created_process_launcher_thread_(false),
       created_cache_thread_(false),
+      created_appcache_thread_(false),
       created_watchdog_thread_(false),
 #if defined(OS_CHROMEOS)
       created_web_socket_proxy_thread_(false),
@@ -260,6 +261,9 @@
   io_thread_.reset();
 
   // The IO thread was the only user of this thread.
+  appcache_thread_.reset();
+
+  // The IO thread was the only user of this thread.
   cache_thread_.reset();
 
   // Stop the process launcher thread after the IO thread, in case the IO thread
@@ -438,6 +442,14 @@
   return cache_thread_.get();
 }
 
+base::Thread* BrowserProcessImpl::appcache_thread() {
+  DCHECK(CalledOnValidThread());
+  if (!created_appcache_thread_)
+    CreateAppCacheThread();
+  return appcache_thread_.get();
+}
+
+
 WatchDogThread* BrowserProcessImpl::watchdog_thread() {
   DCHECK(CalledOnValidThread());
   if (!created_watchdog_thread_)
@@ -901,6 +913,17 @@
   cache_thread_.swap(thread);
 }
 
+void BrowserProcessImpl::CreateAppCacheThread() {
+  DCHECK(!created_appcache_thread_ && !appcache_thread_.get());
+  created_appcache_thread_ = true;
+
+  scoped_ptr<base::Thread> thread(
+      new BrowserThread(BrowserThread::APPCACHE));

[rvargas (doing something else), 2011/10/21 19:46:17]

Just double checking that you don't intend to use async io on this thread.

[michaeln, 2011/10/21 19:52:12]

definitely not right now, i don't anticipate doing so ever, if i eventually do
i'll change the options accordingly

+  if (!thread->Start())
+    return;
+  appcache_thread_.swap(thread);
+}
+
 void BrowserProcessImpl::CreateWatchdogThread() {
   DCHECK(!created_watchdog_thread_ && watchdog_thread_.get() == NULL);
   created_watchdog_thread_ = true;