Print preview page selection should not require a rerendering of draft pages.

chrome/common/print_messages.h

 // 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.
 
 // IPC messages for printing.
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 #include <vector>
 
@@ skipping 184 matching lines @@
   IPC_STRUCT_MEMBER(int, document_cookie)
 
   // Total page count.
   IPC_STRUCT_MEMBER(int, page_count)
 
   // Indicates whether the previewed document is modifiable.
   IPC_STRUCT_MEMBER(bool, is_modifiable)
 
   // The id of the preview request.
   IPC_STRUCT_MEMBER(int, preview_request_id)
+
+  // Indicates whether the existing preview data needs to be cleared or not.
+  IPC_STRUCT_MEMBER(bool, clear_preview_data)
 IPC_STRUCT_END()
 
 // Parameters to describe a rendered page.
 IPC_STRUCT_BEGIN(PrintHostMsg_DidPrintPage_Params)
   // A shared memory handle to the EMF data. This data can be quite large so a
   // memory map needs to be used.
   IPC_STRUCT_MEMBER(base::SharedMemoryHandle, metafile_data_handle)
 
   // Size of the metafile data.
   IPC_STRUCT_MEMBER(uint32, data_size)
@@ skipping 143 matching lines @@
 
 // Asks the browser whether the print preview has been cancelled.
 IPC_SYNC_MESSAGE_ROUTED2_1(PrintHostMsg_CheckForCancel,
                            std::string /* print preview ui address */,
                            int /* request id */,
                            bool /* print preview cancelled */)
 
 // Sends back to the browser the complete rendered document for print preview
 // that was requested by a PrintMsg_PrintPreview message. The memory handle in
 // this message is already valid in the browser process.
-IPC_MESSAGE_ROUTED1(PrintHostMsg_PagesReadyForPreview,
+IPC_MESSAGE_ROUTED1(PrintHostMsg_MetafileReadyForPrinting,
                     PrintHostMsg_DidPreviewDocument_Params /* params */)
 
 // Tell the browser printing failed.
 IPC_MESSAGE_ROUTED1(PrintHostMsg_PrintingFailed,
                     int /* document cookie */)
 
 // Tell the browser print preview failed.
 IPC_MESSAGE_ROUTED1(PrintHostMsg_PrintPreviewFailed,
                     int /* document cookie */)
 
 // Tell the browser print preview was cancelled.
 IPC_MESSAGE_ROUTED1(PrintHostMsg_PrintPreviewCancelled,
                     int /* document cookie */)