PrintPreview: Fix printer color settings issues based on printer ppd/schema information.

chrome/browser/printing/print_dialog_gtk.cc

Index: chrome/browser/printing/print_dialog_gtk.cc
diff --git a/chrome/browser/printing/print_dialog_gtk.cc b/chrome/browser/printing/print_dialog_gtk.cc
index 557fbb4a01765f196e5b433dacfb18d0576bfb0d..e952484d73b5e939cc6ef29d616a55dffb96c383 100644
--- a/chrome/browser/printing/print_dialog_gtk.cc
+++ b/chrome/browser/printing/print_dialog_gtk.cc
@@ -28,12 +28,6 @@ using printing::PrintSettings;
 
 namespace {
 
-// CUPS ColorModel attribute and values.
-const char kCMYK[] = "CMYK";
-const char kCUPSColorModel[] = "cups-ColorModel";
-const char kColor[] = "Color";
-const char kGrayscale[] = "Grayscale";
-
 // CUPS Duplex attribute and values.
 const char kCUPSDuplex[] = "cups-Duplex";
 const char kDuplexNone[] = "None";
@@ -193,19 +187,11 @@ bool PrintDialogGtk::UpdateSettings(const DictionaryValue& settings,
     gtk_print_settings_set_n_copies(gtk_settings_, copies);
     gtk_print_settings_set_collate(gtk_settings_, collate);
 
-    const char* color_mode;
-    switch (color) {
-      case printing::COLOR:
-        color_mode = kColor;
-        break;
-      case printing::CMYK:
-        color_mode = kCMYK;
-        break;
-      default:
-        color_mode = kGrayscale;
-        break;
-    }
-    gtk_print_settings_set(gtk_settings_, kCUPSColorModel, color_mode);
+    std::string color_value;
+    std::string color_setting_name;
+    printing::GetColorModelForMode(color, &color_setting_name, &color_value);
+    gtk_print_settings_set(gtk_settings_, color_setting_name.c_str(),
+                           color_value.c_str());
 
     if (duplex_mode != printing::UNKNOWN_DUPLEX_MODE) {
       const char* cups_duplex_mode = NULL;