Added Header and Footer support using Skia

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 30 matching lines @@
   IPC_STRUCT_MEMBER(int, desired_dpi)
 
   // Cookie for the document to ensure correctness.
   IPC_STRUCT_MEMBER(int, document_cookie)
 
   // Should only print currently selected text.
   IPC_STRUCT_MEMBER(bool, selection_only)
 
   // Does the printer support alpha blending?
   IPC_STRUCT_MEMBER(bool, supports_alpha_blend)
+
+  // Specifies if the header and footer should be printed.
+  IPC_STRUCT_MEMBER(bool, header_footer)
 IPC_STRUCT_END()
 
 IPC_STRUCT_BEGIN(PrintMsg_PrintPage_Params)
   // Parameters to render the page as a printed page. It must always be the same
   // value for all the document.
   IPC_STRUCT_MEMBER(PrintMsg_Print_Params, params)
 
   // The page number is the indicator of the square that should be rendered
   // according to the layout specified in PrintMsg_Print_Params.
   IPC_STRUCT_MEMBER(int, page_number)
@@ skipping 90 matching lines @@
 
 // Tells the render view that printing is done so it can clean up.
 IPC_MESSAGE_ROUTED1(PrintMsg_PrintingDone,
                     bool /* success */)
 
 // Tells the render view that preview printing request has been cancelled.
 IPC_MESSAGE_ROUTED0(PrintMsg_PreviewPrintingRequestCancelled)
 
 // Tells the render view to switch the CSS to print media type, renders every
 // requested pages for print preview using the given |settings|. This gets
-// called multiple times as the user updates settings.
-IPC_MESSAGE_ROUTED1(PrintMsg_PrintPreview,
-                    DictionaryValue /* settings */)
+// called multiple times as the user updates settings. Header Footer info
+// contains the strings, accessible by the browser process, to be printed in
+// the header and footer.
+IPC_MESSAGE_ROUTED2(PrintMsg_PrintPreview,
+                    DictionaryValue /* settings */,
+                    DictionaryValue /* header_footer_info */)

[Lei Zhang, 2011/07/12 22:04:50]

Aren't the header/footer info part of the print preview |settings| ? You can
have a dictionary in a dictionary.

[Aayush Kumar, 2011/07/13 21:52:16]

As discussed, I decided to have them as a separate parameter since the print
preview settings are passed along to the printer settings and a bunch of other
places which isn't really required for the header_footer info strings.
On 2011/07/12 22:04:50, Lei Zhang wrote:

 
 // Tells a renderer to stop blocking script initiated printing.
 IPC_MESSAGE_ROUTED0(PrintMsg_ResetScriptedPrintCount)
 
 
 // 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.
@@ skipping 75 matching lines @@
 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 */)