Use file handles to interact with utility process.

chrome/browser/printing/print_job.h

Index: chrome/browser/printing/print_job.h
diff --git a/chrome/browser/printing/print_job.h b/chrome/browser/printing/print_job.h
index fe1c1e4d97166db11ad6898311f417c49af744d7..316c8b16fe5cfd3176c82e3b55b703314aec06dc 100644
--- a/chrome/browser/printing/print_job.h
+++ b/chrome/browser/printing/print_job.h
@@ -15,15 +15,19 @@
 
 class Thread;
 
+namespace base {
+class RefCountedMemory;
+}
+
 namespace printing {
 
-// See definition below.
 class JobEventDetails;
-
+class MetafilePlayer;
+class PdfToEmfConverter;
+class PrintJobWorker;
 class PrintedDocument;
 class PrintedPage;
 class PrintedPagesSource;
-class PrintJobWorker;
 class PrinterQuery;
 
 // Manages the print work for a specific document. Talks to the printer through
@@ -86,6 +90,12 @@ class PrintJob : public PrintJobWorkerOwner,
   // Access the current printed document. Warning: may be NULL.
   PrintedDocument* document() const;
 
+#if defined(OS_WIN)
+  void ConvertPdfToEmf(const scoped_refptr<base::RefCountedMemory>& bytes,
+                       gfx::Size page_size,

[Lei Zhang, 2014/09/15 21:49:53]

nit: pass by reference?

[Vitaly Buka (NO REVIEWS), 2014/09/15 22:33:50]

Done.

+                       gfx::Rect content_area);
+#endif  // OS_WIN
+
  protected:
   virtual ~PrintJob();
 
@@ -109,6 +119,14 @@ class PrintJob : public PrintJobWorkerOwner,
 
   void HoldUntilStopIsCalled();
 
+#if defined(OS_WIN)
+  // Called on completion of converting the pdf to emf.
+  void OnPdfPageConvertedToEmf(int page_number,
+                               double scale_factor,
+                               scoped_ptr<MetafilePlayer> emf);
+  void OnPdfLoaded(int page_number);
+#endif  // OS_WIN
+
   content::NotificationRegistrar registrar_;
 
   // Source that generates the PrintedPage's (i.e. a WebContents). It will be
@@ -133,6 +151,14 @@ class PrintJob : public PrintJobWorkerOwner,
   // the notified calls Cancel() again.
   bool is_canceling_;
 
+#if defined(OS_WIN)
+  scoped_ptr<PdfToEmfConverter> pdf_to_emf_converter_;
+  int pdf_to_emf_page_count_;
+  int pdf_to_emf_current_page_;
+  gfx::Size pdf_to_emf_page_size_;
+  gfx::Rect pdf_to_emf_content_area_;
+#endif  // OS_WIN
+
   // Used at shutdown so that we can quit a nested message loop.
   base::WeakPtrFactory<PrintJob> quit_factory_;