Use pdf compositor service for printing when OOPIF is enabled

chrome/browser/printing/print_preview_message_handler.h

Index: chrome/browser/printing/print_preview_message_handler.h
diff --git a/chrome/browser/printing/print_preview_message_handler.h b/chrome/browser/printing/print_preview_message_handler.h
index ba7102008ba757b99ccff509e0f5e00690d97321..71ca9d5bb1ee142ed3dbbfaa34cd8ab5d3018002 100644
--- a/chrome/browser/printing/print_preview_message_handler.h
+++ b/chrome/browser/printing/print_preview_message_handler.h
@@ -7,6 +7,9 @@
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
+#include "base/memory/ref_counted_memory.h"
+#include "base/memory/weak_ptr.h"
+#include "components/printing/service/public/interfaces/pdf_compositor.mojom.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
@@ -70,6 +73,27 @@ class PrintPreviewMessageHandler
   void OnSetOptionsFromDocument(
       const PrintHostMsg_SetOptionsFromDocument_Params& params);
 
+  void NotifyUIPreviewPageReady(
+      int page_number,
+      int request_id,
+      scoped_refptr<base::RefCountedBytes> data_bytes);
+  void NotifyUIPreviewDocumentReady(
+      int page_count,
+      int request_id,
+      scoped_refptr<base::RefCountedBytes> data_bytes);
+
+  // Callbacks for pdf compositor client.
+  void OnCompositePdfPageDone(int page_number,
+                              int request_id,
+                              mojom::PdfCompositor::Status status,
+                              mojo::ScopedSharedBufferHandle handle);
+  void OnCompositePdfDocumentDone(int page_count,
+                                  int request_id,
+                                  mojom::PdfCompositor::Status status,
+                                  mojo::ScopedSharedBufferHandle handle);
+
+  base::WeakPtrFactory<PrintPreviewMessageHandler> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewMessageHandler);
 };