Add a switch to prevent logging redirection on chromeos.

chrome/common/logging_chrome.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 "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 210 matching lines @@
     }
     log_dir = log_dir.Append(profile_dir);
   }
   return log_dir;
 }
 
 base::FilePath GetSessionLogFile(const base::CommandLine& command_line) {
   return GetSessionLogDir(command_line).Append(GetLogFileName().BaseName());
 }
 
 void RedirectChromeLogging(const base::CommandLine& command_line) {

[sky, 2017/05/23 17:35:31]

AFAICT this function is only used in chromeos. Code that lives in chrome/common
is meant to be used both in the browser and renderer. This code seems to only be
used in the browser. Can this function be moved to chromeos specific code?

[achuithb, 2017/05/25 19:36:41]

Done.

+  if (command_line.HasSwitch(switches::kDisableLoggingRedirect))
+    return;
+
   if (chrome_logging_redirected_) {
     // TODO(nkostylev): Support multiple active users. http://crbug.com/230345
     LOG(WARNING) << "NOT redirecting logging for multi-profiles case.";
     return;
   }
 
   DCHECK(!chrome_logging_redirected_) <<
     "Attempted to redirect logging when it was already initialized.";
 
   // Redirect logs to the session log directory, if set.  Otherwise
@@ skipping 180 matching lines @@
                                           time_deets.year,
                                           time_deets.month,
                                           time_deets.day_of_month,
                                           time_deets.hour,
                                           time_deets.minute,
                                           time_deets.second);
   return base_path.InsertBeforeExtensionASCII(suffix);
 }
 
 }  // namespace logging