headless: Add command line flags for logging

headless/app/headless_shell_switches.h

 // Copyright 2016 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.
 
 #ifndef HEADLESS_APP_HEADLESS_SHELL_SWITCHES_H_
 #define HEADLESS_APP_HEADLESS_SHELL_SWITCHES_H_
 
+#include "content/public/common/content_switches.h"
+
 namespace headless {
 namespace switches {
 extern const char kDeterministicFetch[];
 extern const char kDumpDom[];
 extern const char kHideScrollbars[];
 extern const char kProxyServer[];
 extern const char kRemoteDebuggingAddress[];
 extern const char kRepl[];
 extern const char kScreenshot[];
 extern const char kTimeout[];
 extern const char kUseGL[];
 extern const char kUserDataDir[];
 extern const char kVirtualTimeBudget[];
 extern const char kWindowSize[];
+
+// Switches which are replicated from content.

[Eric Seckler, 2017/02/02 22:50:12]

while you're at it, shall we move kRemoteDebuggingPort and kHostResolverRules)
over here as well, and then get rid of content_switches.h include in
headless_shell.cc? :)

[Sami, 2017/02/02 23:15:33]

Done.

+using ::switches::kEnableLogging;
+using ::switches::kLoggingLevel;
+
 }  // namespace switches
 }  // namespace headless
 
 #endif  // HEADLESS_APP_HEADLESS_SHELL_SWITCHES_H_