Added support to the Windows cloud print proxy to print XPS documents directl...

chrome/service/cloud_print/print_system_cups.cc

Index: chrome/service/cloud_print/print_system_cups.cc
===================================================================
--- chrome/service/cloud_print/print_system_cups.cc	(revision 74874)
+++ chrome/service/cloud_print/print_system_cups.cc	(working copy)
@@ -95,6 +95,7 @@
   virtual PrintSystem::PrinterWatcher* CreatePrinterWatcher(
       const std::string& printer_name);
   virtual PrintSystem::JobSpooler* CreateJobSpooler();
+  virtual std::string GetSupportedMimeTypes();
 
   // Helper functions.
   PlatformJobId SpoolPrintJob(const std::string& print_ticket,
@@ -644,6 +645,14 @@
   return new JobSpoolerCUPS(this);
 }
 
+std::string PrintSystemCUPS::GetSupportedMimeTypes() {
+  // Since we hand off the document to the CUPS server directly, list some types
+  // that we know CUPS supports (http://www.cups.org/articles.php?L205+TFAQ+Q)
+  // TODO(sanjeevr): Determine this dynamically (http://crbug.com/73240).
+  return
+      "application/pdf,application/postscript,image/jpeg,image/png,image/gif";
+}
+
 std::string PrintSystem::GenerateProxyId() {
   // TODO(gene): This code should generate a unique id for proxy. ID should be
   // unique for this user. Rand may return the same number. We'll need to change