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

printing/printing_context_win.h

Index: printing/printing_context_win.h
diff --git a/printing/printing_context_win.h b/printing/printing_context_win.h
index d42bf9742359bf067ca984b04319f9aeeec30f7f..ccd58b82768c7a178a58eb757e4354d06019af40 100644
--- a/printing/printing_context_win.h
+++ b/printing/printing_context_win.h
@@ -28,6 +28,8 @@ class PrintingContextWin : public PrintingContext {
                                   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();