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

printing/print_settings.h

Index: printing/print_settings.h
diff --git a/printing/print_settings.h b/printing/print_settings.h
index 4e402318eeae81238a7c064da55ab467290c310d..610168452f9bd9c757659e70cc554c619d96efbe 100644
--- a/printing/print_settings.h
+++ b/printing/print_settings.h
@@ -15,6 +15,16 @@
 
 namespace printing {
 
+// Returns true if color model is selected.
+bool isColorModelSelected(int model);
+
+#if defined (USE_CUPS)
+  // Get the color model setting name and value for the |color_mode|.
+  void GetColorModelForMode(int color_mode,
+                            std::string* color_setting_name,
+                            std::string* color_value);
+#endif
+
 // OS-independent print settings.
 class PRINTING_EXPORT PrintSettings {
  public: