Add --headless flag to Windows

headless/lib/browser/headless_print_manager.h

 // 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.
 
 #ifndef HEADLESS_LIB_BROWSER_HEADLESS_PRINT_MANAGER_H_
 #define HEADLESS_LIB_BROWSER_HEADLESS_PRINT_MANAGER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "components/printing/browser/print_manager.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents_user_data.h"
+#include "headless/public/headless_export.h"
 #include "printing/print_settings.h"
 #include "printing/printing_export.h"
 
 struct PrintHostMsg_DidPrintPage_Params;
 struct PrintHostMsg_ScriptedPrint_Params;
 struct PrintMsg_PrintPages_Params;
 
 namespace printing {
 
 struct HeadlessPrintSettings {
@@ skipping 27 matching lines @@
     METAFILE_MAP_ERROR,
     UNEXPECTED_VALID_MEMORY_HANDLE,
     METAFILE_INVALID_HEADER,
     METAFILE_GET_DATA_ERROR,
     SIMULTANEOUS_PRINT_ACTIVE,
     PAGE_RANGE_SYNTAX_ERROR,
     PAGE_COUNT_EXCEEDED,
   };
 
   enum PageRangeStatus {
-    NO_ERROR,
+    PRINT_NO_ERROR,
     SYNTAX_ERROR,
     LIMIT_ERROR,
   };
 
   using GetPDFCallback = base::Callback<void(PrintResult, const std::string&)>;
 
   ~HeadlessPrintManager() override;
 
   static std::string PrintResultToString(PrintResult result);
   static std::unique_ptr<base::DictionaryValue> PDFContentsToDictionaryValue(
       const std::string& data);
-  static PageRangeStatus PageRangeTextToPages(base::StringPiece page_range_text,
-                                              int pages_count,
-                                              std::vector<int>* pages);
+  // Exported for tests.
+  HEADLESS_EXPORT static PageRangeStatus PageRangeTextToPages(
+      base::StringPiece page_range_text,
+      int pages_count,
+      std::vector<int>* pages);
 
   // Prints the current document immediately. Since the rendering is
   // asynchronous, the actual printing will not be completed on the return of
   // this function, and |callback| will always get called when printing
   // finishes.
   void GetPDFContents(content::RenderFrameHost* rfh,
                       const HeadlessPrintSettings& settings,
                       const GetPDFCallback& callback);
 
  private:
@@ skipping 26 matching lines @@
 
   // Set to true when OnDidPrintPage() should be expecting the first page.
   bool expecting_first_page_;
 
   DISALLOW_COPY_AND_ASSIGN(HeadlessPrintManager);
 };
 
 }  // namespace printing
 
 #endif  // HEADLESS_LIB_BROWSER_HEADLESS_PRINT_MANAGER_H_