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 9a88eae8c1d3990239ca2d03fe422e2d319ba6d6..514b3417c4144f86bb3ee2de03b44acbac8a866a 100644
--- a/printing/printing_context_cairo.h
+++ b/printing/printing_context_cairo.h
@@ -40,6 +40,7 @@ class PrintingContextCairo : public PrintingContext {
                                   bool has_selection,
                                   PrintSettingsCallback* callback);
   virtual Result UseDefaultSettings();
+  virtual Result UpdatePrintSettings(const PageRanges& ranges);
   virtual Result InitWithSettings(const PrintSettings& settings);
   virtual Result NewDocument(const string16& document_name);
   virtual Result NewPage();