Use pdf compositor service for printing when OOPIF is enabled

chrome/browser/printing/print_preview_message_handler.h

 // Copyright (c) 2012 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 CHROME_BROWSER_PRINTING_PRINT_PREVIEW_MESSAGE_HANDLER_H_
 #define CHROME_BROWSER_PRINTING_PRINT_PREVIEW_MESSAGE_HANDLER_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
+#include "base/memory/ref_counted_memory.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"
 
 class PrintPreviewUI;
 struct PrintHostMsg_DidGetPreviewPageCount_Params;
 struct PrintHostMsg_DidPreviewDocument_Params;
 struct PrintHostMsg_DidPreviewPage_Params;
 struct PrintHostMsg_RequestPrintPreview_Params;
 struct PrintHostMsg_SetOptionsFromDocument_Params;
 
@@ skipping 43 matching lines @@
       const PrintHostMsg_DidGetPreviewPageCount_Params& params);
   void OnDidPreviewPage(const PrintHostMsg_DidPreviewPage_Params& params);
   void OnMetafileReadyForPrinting(
       const PrintHostMsg_DidPreviewDocument_Params& params);
   void OnPrintPreviewFailed(int document_cookie);
   void OnPrintPreviewCancelled(int document_cookie);
   void OnInvalidPrinterSettings(int document_cookie);
   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_;

[Lei Zhang, 2017/09/09 00:44:59]

#include "base/memory/weak_ptr.h"

+
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewMessageHandler);
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PRINT_PREVIEW_MESSAGE_HANDLER_H_