Print Preview: Associating preview requests and responses using an identifier

chrome/browser/printing/print_preview_message_handler.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/browser/printing/print_preview_message_handler.h"
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 101 matching lines @@
   TabContentsWrapper* wrapper =
       TabContentsWrapper::GetCurrentWrapperForContents(print_preview_tab);
 
   if (params.reuse_existing_data) {
     // Need to match normal rendering where we are expected to send this.
     print_preview_ui->OnDidGetPreviewPageCount(params.expected_pages_count);
 
     print_preview_ui->OnPreviewDataIsAvailable(
         params.expected_pages_count,
         wrapper->print_view_manager()->RenderSourceName(),
-        params.modifiable);
+        params.modifiable,
+        params.preview_request_id);
     return;
   }
 
   base::SharedMemory* shared_buf =
       new base::SharedMemory(params.metafile_data_handle, true);
   if (!shared_buf->Map(params.data_size)) {
     NOTREACHED();
     delete shared_buf;
     return;
   }
 
   wrapper->print_view_manager()->OverrideTitle(tab_contents());
 
   char* preview_data = static_cast<char*>(shared_buf->memory());
   uint32 preview_data_size = params.data_size;
 
   scoped_refptr<RefCountedBytes> html_bytes(new RefCountedBytes);
   html_bytes->data.resize(preview_data_size);
   std::vector<unsigned char>::iterator it = html_bytes->data.begin();
   for (uint32 i = 0; i < preview_data_size; ++i, ++it)
     *it = *(preview_data + i);
 
   print_preview_ui->SetPrintPreviewData(html_bytes.get());
   print_preview_ui->OnPreviewDataIsAvailable(
       params.expected_pages_count,
       wrapper->print_view_manager()->RenderSourceName(),
-      params.modifiable);
+      params.modifiable,
+      params.preview_request_id);
 }
 
 void PrintPreviewMessageHandler::OnPrintPreviewFailed(int document_cookie) {
   // Always need to stop the worker.
   StopWorker(document_cookie);
 
   // Inform the print preview tab of the failure.
   TabContents* print_preview_tab = GetPrintPreviewTab();
   // User might have closed it already.
   if (!print_preview_tab)
@@ skipping 48 matching lines @@
 }
 
 void PrintPreviewMessageHandler::DidStartLoading() {
   if (tab_contents()->delegate() &&
       printing::PrintPreviewTabController::IsPrintPreviewTab(tab_contents())) {
     tab_contents()->SetContentRestrictions(CONTENT_RESTRICTION_PRINT);
   }
 }
 
 }  // namespace printing