On Chrome OS, use the application locale to determine the default paper size ...

printing/printing_context.h

Index: printing/printing_context.h
===================================================================
--- printing/printing_context.h	(revision 67925)
+++ printing/printing_context.h	(working copy)
@@ -84,7 +84,7 @@
   // Creates an instance of this object. Implementers of this interface should
   // implement this method to create an object of their implementation. The
   // caller owns the returned object.
-  static PrintingContext* Create();
+  static PrintingContext* Create(const std::string& app_locale);
 
   void set_use_overlays(bool use_overlays) {
     settings_.use_overlays = use_overlays;
@@ -95,7 +95,7 @@
   }
 
  protected:
-  PrintingContext();
+  explicit PrintingContext(const std::string& app_locale);
 
   // Reinitializes the settings for object reuse.
   void ResetSettings();
@@ -115,6 +115,9 @@
   // Did the user cancel the print job.
   volatile bool abort_printing_;
 
+  // The application locale.
+  std::string app_locale_;
+
   DISALLOW_COPY_AND_ASSIGN(PrintingContext);
 };