Print Preview: Hook up the print button to initiate a normal print operation....

chrome/browser/dom_ui/print_preview_handler.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.
 
 #ifndef CHROME_BROWSER_DOM_UI_PRINT_PREVIEW_HANDLER_H_
 #define CHROME_BROWSER_DOM_UI_PRINT_PREVIEW_HANDLER_H_
 #pragma once
 
 #include "base/ref_counted.h"
 #include "base/weak_ptr.h"
 #include "chrome/browser/dom_ui/dom_ui.h"
 
 namespace printing {
 class PrintBackend;
 }
 
 // The handler for Javascript messages related to the "print preview" dialog.
 class PrintPreviewHandler : public WebUIMessageHandler,
                             public base::SupportsWeakPtr<PrintPreviewHandler> {
  public:
   PrintPreviewHandler();
   virtual ~PrintPreviewHandler();
 
   // WebUIMessageHandler implementation.
   virtual void RegisterMessages();
 
  private:
   // Get the list of printers and send it to the Web UI. |args| is unused.
   void HandleGetPrinters(const ListValue* args);
+  void HandlePrint(const ListValue* args);
 
   // Pointer to current print system.
   scoped_refptr<printing::PrintBackend> print_backend_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewHandler);
 };
 
 #endif  // CHROME_BROWSER_DOM_UI_PRINT_PREVIEW_HANDLER_H_