ThreadRestrictions: disallow blocking IO on the UI thread

chrome/browser/browser.cc

 // Copyright (c) 2010 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.h"
 
 #if defined(OS_WIN)
 #include <shellapi.h>
 #include <windows.h>
 #endif  // OS_WIN
 
 #include <algorithm>
 #include <string>
 
 #include "app/animation.h"
 #include "app/l10n_util.h"
 #include "base/base_paths.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
 #include "base/thread.h"
+#include "base/thread_restrictions.h"
 #include "base/utf_string_conversions.h"
 #include "gfx/point.h"
 #include "chrome/app/chrome_dll_resource.h"
 #include "chrome/browser/autofill/autofill_manager.h"
 #if defined(OS_WIN)
 #include "chrome/browser/autofill/autofill_ie_toolbar_import_win.h"
 #endif  // defined(OS_WIN)
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/bookmarks/bookmark_utils.h"
 #include "chrome/browser/browser_list.h"
@@ skipping 2295 matching lines @@
   ScheduleUIUpdate(contents, TabContents::INVALIDATE_URL);
 
   if (contents_is_selected)
     contents->Focus();
 }
 
 GURL Browser::GetHomePage() const {
   // --homepage overrides any preferences.
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kHomePage)) {
+    // TODO(evanm): clean up usage of DIR_CURRENT.
+    //   http://code.google.com/p/chromium/issues/detail?id=60630
+    // For now, allow this code to call getcwd().
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
+
     FilePath browser_directory;
     PathService::Get(base::DIR_CURRENT, &browser_directory);
     GURL home_page(URLFixerUpper::FixupRelativeFile(browser_directory,
         command_line.GetSwitchValuePath(switches::kHomePage)));
     if (home_page.is_valid())
       return home_page;
   }
 
   if (profile_->GetPrefs()->GetBoolean(prefs::kHomePageIsNewTabPage))
     return GURL(chrome::kChromeUINewTabURL);
@@ skipping 1941 matching lines @@
   NOTREACHED();
   return false;
 }
 
 void Browser::CreateInstantIfNecessary() {
   if (type() == TYPE_NORMAL && InstantController::IsEnabled(profile()) &&
       !profile()->IsOffTheRecord()) {
     instant_.reset(new InstantController(this));
   }
 }