Temporary whitelist several cases of disk I/O on the UI threads in cros.

chrome/common/logging_chrome.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 "build/build_config.h"
 
 // Need to include this before most other files because it defines
 // IPC_MESSAGE_LOG_ENABLED. We need to use it to define
 // IPC_MESSAGE_MACROS_LOG_ENABLED so render_messages.h will generate the
 // ViewMsgLog et al. functions.
@@ skipping 22 matching lines @@
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/debug/debugger.h"
 #include "base/environment.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/env_vars.h"
 #include "ipc/ipc_logging.h"
 #if defined(OS_WIN)
 #include "base/logging_win.h"
 #include <initguid.h>
 #endif
@@ skipping 153 matching lines @@
 }
 
 void RedirectChromeLogging(const CommandLine& command_line) {
   DCHECK(!chrome_logging_redirected_) <<
     "Attempted to redirect logging when it was already initialized.";
 
   // Redirect logs to the session log directory, if set.  Otherwise
   // defaults to the profile dir.
   FilePath log_path = GetSessionLogFile(command_line);
 
+  // Creating symlink causes us to do blocking IO on UI thread.
+  // Temporarily allow it until we fix http://crbug.com/61143
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   // Always force a new symlink when redirecting.
   FilePath target_path = SetUpSymlinkIfNeeded(log_path, true);
 
   logging::DcheckState dcheck_state =
       command_line.HasSwitch(switches::kEnableDCHECK) ?
       logging::ENABLE_DCHECK_FOR_NON_OFFICIAL_RELEASE_BUILDS :
       logging::DISABLE_DCHECK_FOR_NON_OFFICIAL_RELEASE_BUILDS;
 
   // ChromeOS always logs through the symlink, so it shouldn't be
   // deleted if it already exists.
@@ skipping 170 matching lines @@
         assertions->push_back(wide_line);
       ++assertion_count;
     }
   }
   log_file.close();
 
   return assertion_count;
 }
 
 }  // namespace logging