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

printing/printing_context_cairo.h

 // Copyright (c) 2010 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 PRINTING_PRINTING_CONTEXT_CAIRO_H_
 #define PRINTING_PRINTING_CONTEXT_CAIRO_H_
 
 #include <string>
 
 #include "printing/printing_context.h"
 
 namespace printing {
 
 class PrintingContextCairo : public PrintingContext {
  public:
   explicit PrintingContextCairo(const std::string& app_locale);
   ~PrintingContextCairo();
 
   // PrintingContext implementation.
   virtual void AskUserForSettings(gfx::NativeView parent_view,
                                   int max_pages,
                                   bool has_selection,
                                   PrintSettingsCallback* callback);
   virtual Result UseDefaultSettings();
+  virtual Result UpdatePrintSettings(const std::string& job_settings,
+                                     const PageRanges& ranges);
   virtual Result InitWithSettings(const PrintSettings& settings);
   virtual Result NewDocument(const string16& document_name);
   virtual Result NewPage();
   virtual Result PageDone();
   virtual Result DocumentDone();
   virtual void Cancel();
   virtual void ReleaseContext();
   virtual gfx::NativeDrawingContext context() const;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PrintingContextCairo);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PRINTING_CONTEXT_CAIRO_H_