Print Preview: Making margin selection sticky (part 2/2, again)

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 325 matching lines @@
 // Asks the browser to create a temporary file for the renderer to fill
 // in resulting NativeMetafile in printing.
 IPC_SYNC_MESSAGE_CONTROL0_2(PrintHostMsg_AllocateTempFileForPrinting,
                             base::FileDescriptor /* temp file fd */,
                             int /* fd in browser*/)
 IPC_MESSAGE_CONTROL1(PrintHostMsg_TempFileForPrintingWritten,
                      int /* fd in browser */)
 #endif
 
 // Asks the browser to do print preview.
-IPC_MESSAGE_ROUTED0(PrintHostMsg_RequestPrintPreview)
+IPC_MESSAGE_ROUTED1(PrintHostMsg_RequestPrintPreview, bool /* is_modifiable */)
 
 // Notify the browser the number of pages in the print preview document.
 IPC_MESSAGE_ROUTED1(PrintHostMsg_DidGetPreviewPageCount,
                     PrintHostMsg_DidGetPreviewPageCount_Params /* params */)
 
 // Notify the browser of the default page layout according to the currently
 // selected printer and page size.
 IPC_MESSAGE_ROUTED1(PrintHostMsg_DidGetDefaultPageLayout,
                     printing::PageSizeMargins /* page layout in points */)
 
@@ skipping 23 matching lines @@
 
 // Tell the browser print preview was cancelled.
 IPC_MESSAGE_ROUTED1(PrintHostMsg_PrintPreviewCancelled,
                     int /* document cookie */)
 
 // Tell the browser print preview found the selected printer has invalid
 // settings (which typically caused by disconnected network printer or printer
 // driver is bogus).
 IPC_MESSAGE_ROUTED1(PrintHostMsg_PrintPreviewInvalidPrinterSettings,
                     int /* document cookie */)