Fix the crashes in interactive_ui_tests on Linux....

chrome/browser/browser_main.cc

 // Copyright (c) 2006-2009 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 "chrome/browser/browser_main.h"
 
 #include <algorithm>
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
@@ skipping 392 matching lines @@
   PrefService* local_state = browser_process->local_state();
   DCHECK(local_state);
 
   // Initialize ResourceBundle which handles files loaded from external
   // sources. This has to be done before uninstall code path and before prefs
   // are registered.
   local_state->RegisterStringPref(prefs::kApplicationLocale, L"");
   local_state->RegisterBooleanPref(prefs::kMetricsReportingEnabled,
       GoogleUpdateSettings::GetCollectStatsConsent());
 
-  // Start the database thread (the order of when this happens in this function
-  // doesn't matter, all we need is to kick it off).
-  browser_process->db_thread();
-
 #if defined(TOOLKIT_GTK)
   // It is important for this to happen before the first run dialog, as it
   // styles the dialog as well.
   gtk_util::InitRCStyles();
 #elif defined(TOOLKIT_VIEWS)
   // The delegate needs to be set before any UI is created so that windows
   // display the correct icon.
   if (!views::ViewsDelegate::views_delegate)
     views::ViewsDelegate::views_delegate = new ChromeViewsDelegate;
 #endif
@@ skipping 284 matching lines @@
   // Sets things up so that if we crash from this point on, a dialog will
   // popup asking the user to restart chrome. It is done this late to avoid
   // testing against a bunch of special cases that are taken care early on.
   PrepareRestartOnCrashEnviroment(parsed_command_line);
 
 #if defined(OS_WIN)
   // Initialize Winsock.
   net::EnsureWinsockInit();
 #endif  // defined(OS_WIN)
 
+  // Create the child threads.  We need to do this since ChromeThread::PostTask
+  // silently deletes a posted task if the target message loop isn't created.
+  browser_process->db_thread();
+  browser_process->file_thread();
+  browser_process->io_thread();
+
   // Initialize and maintain DNS prefetcher module.
   chrome_browser_net::DnsPrefetcherInit dns_prefetch(user_prefs, local_state);
 
   scoped_refptr<FieldTrial> http_prioritization_trial =
       new FieldTrial("HttpPrioritization", 100);
   // Put 10% of people in the fallback experiment with the http prioritization
   // code disabled.
   const int holdback_group =
       http_prioritization_trial->AppendGroup("_no_http_prioritization", 10);
   if (http_prioritization_trial->group() == holdback_group) {
@@ skipping 164 matching lines @@
   if (metrics)
     metrics->Stop();
 
   // browser_shutdown takes care of deleting browser_process, so we need to
   // release it.
   browser_process.release();
   browser_shutdown::Shutdown();
 
   return result_code;
 }