Print Preview: Associating preview requests and responses using an identifier

chrome/renderer/print_web_view_helper_linux.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/renderer/print_web_view_helper.h"
 
 #include "base/file_descriptor_posix.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
@@ skipping 31 matching lines @@
   // Get the size of the resulting metafile.
   uint32 buf_size = metafile.GetDataSize();
   DCHECK_GT(buf_size, 0u);
 
   PrintHostMsg_DidPreviewDocument_Params preview_params;
   preview_params.reuse_existing_data = false;
   preview_params.data_size = buf_size;
   preview_params.document_cookie = params.params.document_cookie;
   preview_params.expected_pages_count = preview_page_count_;
   preview_params.modifiable = IsModifiable(frame, node);
+  preview_params.preview_request_id = params.params.preview_request_id;
 
   if (!CopyMetafileDataToSharedMem(&metafile,
                                    &(preview_params.metafile_data_handle))) {
     return false;
   }
   Send(new PrintHostMsg_PagesReadyForPreview(routing_id(), preview_params));
   return true;
 }
 
 bool PrintWebViewHelper::PrintPages(const PrintMsg_PrintPages_Params& params,
@@ skipping 184 matching lines @@
   canvas->unref();  // SkRefPtr and new both took a reference.
   printing::MetafileSkiaWrapper::SetMetafileOnCanvas(canvas.get(), metafile);
   frame->printPage(params.page_number, canvas.get());
 
   // TODO(myhuang): We should render the header and the footer.
 
   // Done printing. Close the device context to retrieve the compiled metafile.
   if (!metafile->FinishPage())
     NOTREACHED() << "metafile failed";
 }