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

printing/printing_context_cairo.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "printing/printing_context_cairo.h"
 
 #include "base/logging.h"
 #include "printing/units.h"
 
 #if defined(OS_CHROMEOS)
@@ skipping 133 matching lines @@
           settings, page_setup, ranges_vector, false, &settings_);
 
   g_object_unref(settings);
   // |page_setup| is owned by dialog, so it does not need to be unref'ed.
   gtk_widget_destroy(dialog);
 #endif  // defined(OS_CHROMEOS)
 
   return OK;
 }
 
+PrintingContext::Result PrintingContextCairo::UpdatePrintSettings(
+    const PageRanges& ranges) {
+  DCHECK(!in_print_job_);
+
+  settings_.ranges = ranges;
+
+  NOTIMPLEMENTED();
+
+  return FAILED;
+}
+
 PrintingContext::Result PrintingContextCairo::InitWithSettings(
     const PrintSettings& settings) {
   DCHECK(!in_print_job_);
 
   settings_ = settings;
 
   return OK;
 }
 
 PrintingContext::Result PrintingContextCairo::NewDocument(
@@ skipping 45 matching lines @@
 void PrintingContextCairo::ReleaseContext() {
   // Intentional No-op.
 }
 
 gfx::NativeDrawingContext PrintingContextCairo::context() const {
   // Intentional No-op.
   return NULL;
 }
 
 }  // namespace printing