PrintPreview: Added code to honor the grayscale color model.

chrome/browser/printing/print_system_task_proxy.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 "chrome/browser/printing/print_system_task_proxy.h"
 
 #include <ctype.h>
 
 #include <string>
 #include <vector>
@@ skipping 130 matching lines @@
     ppd_file_t* ppd, int* color_model_for_black, int* color_model_for_color,
     bool* color_is_default) {
   ppd_option_t* color_model = ppdFindOption(ppd, kColorModel);
   if (!color_model)
     return false;
 
   if (ppdFindChoice(color_model, printing::kBlack))
     *color_model_for_black = printing::BLACK;
   else if (ppdFindChoice(color_model, printing::kGray))
     *color_model_for_black = printing::GRAY;
+  else if (ppdFindChoice(color_model, printing::kGrayscale))
+    *color_model_for_black = printing::GRAYSCALE;
 
   if (ppdFindChoice(color_model, printing::kColor))
     *color_model_for_color = printing::COLOR;
   else if (ppdFindChoice(color_model, printing::kCMYK))
     *color_model_for_color = printing::CMYK;
   else if (ppdFindChoice(color_model, printing::kRGB))
     *color_model_for_color = printing::RGB;
   else if (ppdFindChoice(color_model, printing::kRGBA))
     *color_model_for_color = printing::RGBA;
   else if (ppdFindChoice(color_model, printing::kRGB16))
@@ skipping 373 matching lines @@
       base::Bind(&PrintSystemTaskProxy::SendPrinterCapabilities, this,
                  settings_info.DeepCopy()));
 }
 
 void PrintSystemTaskProxy::SendPrinterCapabilities(
     DictionaryValue* settings_info) {
   if (handler_)
     handler_->SendPrinterCapabilities(*settings_info);
   delete settings_info;
 }