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

printing/printing_context_mac.mm

Index: printing/printing_context_mac.mm
diff --git a/printing/printing_context_mac.mm b/printing/printing_context_mac.mm
index 1826c493e6feb6719b8c1f9b34a7a9ccacde73e9..01971cbe3d50c9ff35bf88cd9988b8b0d5373a11 100644
--- a/printing/printing_context_mac.mm
+++ b/printing/printing_context_mac.mm
@@ -80,6 +80,19 @@ PrintingContext::Result PrintingContextMac::UseDefaultSettings() {
   return OK;
 }
 
+PrintingContext::Result PrintingContextMac::UpdatePrintSettings(
+    const std::string& job_settings, const PageRanges& ranges) {
+  DCHECK(!in_print_job_);
+
+  // TODO (kmadhusu): Update other print job settings such as number of copies,
+  // collate, etc.,
+
+  // Update the print range information.
+  settings_.ranges = ranges;
+
+  return OK;
+}
+
 void PrintingContextMac::ParsePrintInfo(NSPrintInfo* print_info) {
   ResetSettings();
   print_info_ = [print_info retain];