Print Preview: Hook up the print button to initiate printing without displaying a print dialog.

chrome/browser/renderer_host/render_message_filter.h

Index: chrome/browser/renderer_host/render_message_filter.h
diff --git a/chrome/browser/renderer_host/render_message_filter.h b/chrome/browser/renderer_host/render_message_filter.h
index ff50fab7ea028632cd62ea51f687e6dc60f59213..31351081c24a22e934750af13ccb45da27bf6188 100644
--- a/chrome/browser/renderer_host/render_message_filter.h
+++ b/chrome/browser/renderer_host/render_message_filter.h
@@ -272,6 +272,17 @@ class RenderMessageFilter : public BrowserMessageFilter,
       scoped_refptr<printing::PrinterQuery> printer_query,
       IPC::Message* reply_msg);
 
+  // Get the current print settings right here synchronously.
+  void OnGetCurrentPrintSettings(int document_cookie, IPC::Message* reply_msg);
+
+  // Update current print settings with new |job_settings|.
+  void OnUpdatePrintSettings(int document_cookie,
+                             const std::string& job_settings,
+                             IPC::Message* reply_msg);
+  void OnUpdatePrintSettingsReply(
+      scoped_refptr<printing::PrinterQuery> printer_query,
+      IPC::Message* reply_msg);
+
   // A javascript code requested to print the current page. The renderer host
   // have to show to the user the print dialog and returns the selected print
   // settings.