Initial support for cloudprint in print preview

printing/backend/print_backend_chromeos.cc

Index: printing/backend/print_backend_chromeos.cc
diff --git a/printing/backend/print_backend_chromeos.cc b/printing/backend/print_backend_chromeos.cc
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index 0000000000000000000000000000000000000000..96c08491e366b4e33c376be98581006181b48bab
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+++ b/printing/backend/print_backend_chromeos.cc
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+// Copyright (c) 2010 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 "printing/backend/print_backend.h"
+
+#include "base/logging.h"
+
+namespace printing {
+
+// Provides a stubbed out PrintBackend implementation for use on ChromeOS.
+class PrintBackendChromeOS : public PrintBackend {
+ public:
+  PrintBackendChromeOS();
+  virtual ~PrintBackendChromeOS() {}
+
+  // PrintBackend implementation.
+  virtual bool EnumeratePrinters(PrinterList* printer_list);
+
+  virtual std::string GetDefaultPrinterName();
+
+  virtual bool GetPrinterCapsAndDefaults(const std::string& printer_name,
+                                         PrinterCapsAndDefaults* printer_info);
+
+  virtual bool IsValidPrinter(const std::string& printer_name);
+
+ private:
+};
+
+PrintBackendChromeOS::PrintBackendChromeOS() {}
+
+bool PrintBackendChromeOS::EnumeratePrinters(PrinterList* printer_list) {
+  return true;
+}
+
+
+
+bool PrintBackendChromeOS::GetPrinterCapsAndDefaults(
+    const std::string& printer_name,
+    PrinterCapsAndDefaults* printer_info) {
+  NOTREACHED();
+  return false;
+}
+
+std::string PrintBackendChromeOS::GetDefaultPrinterName() {
+  return std::string();
+}
+
+bool PrintBackendChromeOS::IsValidPrinter(const std::string& printer_name) {
+  NOTREACHED();
+  return true;
+}
+
+scoped_refptr<PrintBackend> PrintBackend::CreateInstance(
+    const DictionaryValue* print_backend_settings) {
+  return new PrintBackendChromeOS();
+}
+
+}  // namespace printing
+