add customized printing setting for headless

headless/lib/browser/headless_print_manager.h

Index: headless/lib/browser/headless_print_manager.h
diff --git a/headless/lib/browser/headless_print_manager.h b/headless/lib/browser/headless_print_manager.h
index 6d35bfae461d890d9a9d3d529c413c6b3ec82aa7..b5474a0887bd03594cce225d10fed2cd441d39d6 100644
--- a/headless/lib/browser/headless_print_manager.h
+++ b/headless/lib/browser/headless_print_manager.h
@@ -11,11 +11,47 @@
 #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 "printing/print_settings.h"
 
 struct PrintHostMsg_DidPrintPage_Params;
+struct PrintHostMsg_ScriptedPrint_Params;
+struct PrintMsg_PrintPages_Params;
 
 namespace printing {
 
+struct HeadlessPrintSettings {
+  enum PaperType {
+    LETTER,
+    LEGAL,
+    A4,
+    A3,
+  };
+
+  HeadlessPrintSettings();
+  HeadlessPrintSettings(const HeadlessPrintSettings& obj);
+  ~HeadlessPrintSettings();
+
+  int GetDPI();
+  gfx::Size PaperSizeInPixel();
+  PageMargins MarginInPoints();
+
+  int dpi;
+  PaperType paper_type;
+
+  MarginType margin_type;
+  double margin_top_in_inch;
+  double margin_bottom_in_inch;
+  double margin_left_in_inch;
+  double margin_right_in_inch;
+
+  bool landscape;
+  bool display_header_footer;
+  bool should_print_backgrounds;
+  double scale;
+
+  PageRanges page_ranges;
+};
+
 class HeadlessPrintManager
     : public PrintManager,
       public content::WebContentsUserData<HeadlessPrintManager> {
@@ -30,6 +66,7 @@ class HeadlessPrintManager
     METAFILE_INVALID_HEADER,
     METAFILE_GET_DATA_ERROR,
     SIMULTANEOUS_PRINT_ACTIVE,
+    EXCEED_PAGE_LIMIT,
   };
 
   using GetPDFCallback = base::Callback<void(PrintResult, const std::string&)>;
@@ -45,20 +82,26 @@ class HeadlessPrintManager
   // this function, and |callback| will always get called when printing
   // finishes.
   void GetPDFContents(content::RenderFrameHost* rfh,
+                      HeadlessPrintSettings settings,
                       const GetPDFCallback& callback);
 
  private:
   explicit HeadlessPrintManager(content::WebContents* web_contents);
   friend class content::WebContentsUserData<HeadlessPrintManager>;
 
+  std::unique_ptr<PrintMsg_PrintPages_Params> PrintParams(
+      HeadlessPrintSettings settings);
   // content::WebContentsObserver implementation.
   bool OnMessageReceived(const IPC::Message& message,
                          content::RenderFrameHost* render_frame_host) override;
 
   // IPC Message handlers.
   void OnGetDefaultPrintSettings(IPC::Message* reply_msg);
+  void OnScriptedPrint(const PrintHostMsg_ScriptedPrint_Params& params,
+                       IPC::Message* reply_msg);
   void OnShowInvalidPrinterSettingsError();
   void OnPrintingFailed(int cookie) override;
+  void OnDidGetPrintedPagesCount(int cookie, int number_pages) override;
   void OnDidPrintPage(const PrintHostMsg_DidPrintPage_Params& params);
 
   void Reset();
@@ -66,6 +109,7 @@ class HeadlessPrintManager
 
   content::RenderFrameHost* printing_rfh_;
   GetPDFCallback callback_;
+  std::unique_ptr<PrintMsg_PrintPages_Params> print_params_;
   std::string data_;
 
   // Set to true when OnDidPrintPage() should be expecting the first page.