CommandLine: add a CopySwitchesFrom() for copying from another CommandLine

chrome/browser/worker_host/worker_process_host.cc

 // Copyright (c) 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/worker_host/worker_process_host.h"
 
 #include <set>
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 89 matching lines @@
   if (!CreateChannel())
     return false;
 
   FilePath exe_path = GetChildPath(true);
   if (exe_path.empty())
     return false;
 
   CommandLine* cmd_line = new CommandLine(exe_path);
   cmd_line->AppendSwitchWithValue(switches::kProcessType,
                                   switches::kWorkerProcess);
-  cmd_line->AppendSwitchWithValue(switches::kProcessChannelID,
-                                  ASCIIToWide(channel_id()));
+  cmd_line->AppendSwitchWithValue(switches::kProcessChannelID, channel_id());
   SetCrashReporterCommandLine(cmd_line);
 
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableNativeWebWorkers)) {
     cmd_line->AppendSwitch(switches::kEnableNativeWebWorkers);
   }
 
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kWebWorkerShareProcesses)) {
     cmd_line->AppendSwitch(switches::kWebWorkerShareProcesses);
@@ skipping 11 matching lines @@
 
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableLogging)) {
     cmd_line->AppendSwitch(switches::kEnableLogging);
   }
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kLoggingLevel)) {
     const std::wstring level =
         CommandLine::ForCurrentProcess()->GetSwitchValue(
             switches::kLoggingLevel);
-    cmd_line->AppendSwitchWithValue(
-        switches::kLoggingLevel, level);
+    cmd_line->AppendSwitchWithValue(switches::kLoggingLevel, level);
   }
 
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableWebSockets)) {
     cmd_line->AppendSwitch(switches::kDisableWebSockets);
   }
 
 #if defined(OS_WIN)
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableDesktopNotifications)) {
@@ skipping 474 matching lines @@
     }
   }
   return false;
 }
 
 WorkerProcessHost::WorkerInstance::SenderInfo
 WorkerProcessHost::WorkerInstance::GetSender() const {
   DCHECK(NumSenders() == 1);
   return *senders_.begin();
 }