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 "base/values.h"
 #include "base/shared_memory.h"
 #include "ipc/ipc_message_macros.h"
@@ skipping 111 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 60 matching lines @@
 IPC_MESSAGE_ROUTED1(PrintMsg_PrintPreview,
                     DictionaryValue /* settings */)
 
 // Like PrintMsg_PrintPages, but using the print preview document's frame/node.
 IPC_MESSAGE_ROUTED0(PrintMsg_PrintForSystemDialog)
 
 // Tells a renderer to stop blocking script initiated printing.
 IPC_MESSAGE_ROUTED0(PrintMsg_ResetScriptedPrintCount)
 
 // Tells a renderer to continue generating the print preview.
-// Use |requested_preview_page_index| to request a specific preview page data.
-// |requested_preview_page_index| is 1-based or |printing::INVALID_PAGE_INDEX|
-// to render the next page.
-IPC_MESSAGE_ROUTED1(PrintMsg_ContinuePreview,
-                    int /* requested_preview_page_index */)
+IPC_MESSAGE_ROUTED0(PrintMsg_ContinuePreview)
 
 // Tells a renderer to abort the print preview and reset all state.
 IPC_MESSAGE_ROUTED0(PrintMsg_AbortPreview)
 
 // Messages sent from the renderer to the browser.
 
 #if defined(OS_WIN)
 // Duplicates a shared memory handle from the renderer to the browser. Then
 // the renderer can flush the handle.
 IPC_SYNC_MESSAGE_ROUTED1_1(PrintHostMsg_DuplicateSection,
@@ skipping 57 matching lines @@
 IPC_MESSAGE_ROUTED1(PrintHostMsg_DidGetPreviewPageCount,
                     PrintHostMsg_DidGetPreviewPageCount_Params /* params */)
 
 // Notify the browser a print preview page has been rendered.
 IPC_MESSAGE_ROUTED1(PrintHostMsg_DidPreviewPage,
                     PrintHostMsg_DidPreviewPage_Params /* params */)
 
 // 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 */)