Add --headless flag to Windows

headless/lib/browser/headless_devtools_manager_delegate.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_LIB_BROWSER_HEADLESS_DEVTOOLS_MANAGER_DELEGATE_H_
 #define HEADLESS_LIB_BROWSER_HEADLESS_DEVTOOLS_MANAGER_DELEGATE_H_
 
 #include <map>
 #include <memory>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/memory/weak_ptr.h"
 #include "base/values.h"
 #include "content/public/browser/devtools_manager_delegate.h"
 #include "printing/features/features.h"
 
 #if BUILDFLAG(ENABLE_BASIC_PRINTING)
 #include "headless/lib/browser/headless_print_manager.h"
+#include "headless/public/headless_export.h"
 #endif
 
 namespace headless {
 class HeadlessBrowserImpl;
 
 #if BUILDFLAG(ENABLE_BASIC_PRINTING)
-std::unique_ptr<base::DictionaryValue> ParsePrintSettings(
+// Exported for tests.
+HEADLESS_EXPORT std::unique_ptr<base::DictionaryValue> ParsePrintSettings(
     int command_id,
     const base::DictionaryValue* params,
     printing::HeadlessPrintSettings* settings);
 #endif
 
 class HeadlessDevToolsManagerDelegate
     : public content::DevToolsManagerDelegate {
  public:
   explicit HeadlessDevToolsManagerDelegate(
       base::WeakPtr<HeadlessBrowserImpl> browser);
@@ skipping 39 matching lines @@
                           int command_id,
                           const base::DictionaryValue* params,
                           const CommandCallback& callback)>;
   std::map<std::string, CommandMemberCallback> command_map_;
   std::map<std::string, AsyncCommandMemberCallback> async_command_map_;
 };
 
 }  // namespace headless
 
 #endif  // HEADLESS_LIB_BROWSER_HEADLESS_DEVTOOLS_MANAGER_DELEGATE_H_