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

printing/printing_context_mac.h

Index: printing/printing_context_mac.h
diff --git a/printing/printing_context_mac.h b/printing/printing_context_mac.h
index 8f6bf34c41fa66e03ff6a67614e70d2ca9e37172..2f76e4aa17dc729c25d1b6e5a521438795aee44d 100644
--- a/printing/printing_context_mac.h
+++ b/printing/printing_context_mac.h
@@ -28,6 +28,8 @@ class PrintingContextMac : 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();