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

printing/printing_context_cairo.h

Index: printing/printing_context_cairo.h
diff --git a/printing/printing_context_cairo.h b/printing/printing_context_cairo.h
index ac42239d89a12655bb248172fae20b6f92a5bc05..e8497f62dfd39919a2954eedffd7a41b12198881 100644
--- a/printing/printing_context_cairo.h
+++ b/printing/printing_context_cairo.h
@@ -22,6 +22,8 @@ class PrintingContextCairo : 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();