Add a switch to prevent logging redirection on chromeos.

chrome/browser/chromeos/logging.cc

 // Copyright 2017 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/chromeos/logging.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/task_scheduler/post_task.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/common/logging_chrome.h"
 #include "content/public/browser/browser_thread.h"
 
 namespace logging {
 
 namespace {
 
 // This should be true for exactly the period between the end of
 // InitChromeLogging() and the beginning of CleanupChromeLogging().
 bool chrome_logging_redirected_ = false;
@@ skipping 22 matching lines @@
 
 void RedirectChromeLogging(const base::CommandLine& command_line) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   if (chrome_logging_redirected_) {
     // TODO: 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.";
+  if (command_line.HasSwitch(switches::kDisableLoggingRedirect))
+    return;
 
   // Redirect logs to the session log directory, if set.  Otherwise
   // defaults to the profile dir.
   const base::FilePath log_path = GetSessionLogFile(command_line);
 
   // Always force a new symlink when redirecting.
   base::PostTaskWithTraitsAndReplyWithResult(
       FROM_HERE, {base::MayBlock()},
       base::BindOnce(&SetUpSymlinkIfNeeded, log_path, true),
       base::BindOnce(&SymlinkSetUp, command_line, log_path));
 }
 
 }  // namespace logging