Add policy to use system default printer

chrome/common/pref_names.h

 // Copyright (c) 2012 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.
 
 // Constants for the names of various preferences, for easier changing.
 
 #ifndef CHROME_COMMON_PREF_NAMES_H_
 #define CHROME_COMMON_PREF_NAMES_H_
 
 #include <stddef.h>
@@ skipping 409 matching lines @@
 extern const char kProfileGAIAInfoPictureURL[];
 
 extern const char kProfileAvatarTutorialShown[];
 
 extern const char kInvertNotificationShown[];
 
 extern const char kPrintingEnabled[];
 extern const char kPrintPreviewDisabled[];
 extern const char kPrintPreviewDefaultDestinationSelectionRules[];
 
+#if !defined(OS_CHROMEOS) && !defined(OS_ANDROID) && !defined(OS_IOS)
+extern const char kPrintPreviewUseSystemDefaultPrinter[];
+#endif  // !OS_CHROMEOS && !OS_ANDROID && !OS_IOS

[Lei Zhang, 2017/06/19 23:41:40]

I wouldn't bother with the comment when the #if block is only 1 line long.

[rbpotter, 2017/06/20 02:58:25]

Done.

+
 #if defined(OS_CHROMEOS)
 extern const char kPrintingDevices[];
 extern const char kRecommendedNativePrinters[];
 #endif  // OS_CHROMEOS
 
 extern const char kDefaultSupervisedUserFilteringBehavior[];
 
 extern const char kSupervisedUserCreationAllowed[];
 extern const char kSupervisedUsers[];
 
@@ skipping 485 matching lines @@
 extern const char kClipboardLastModifiedTime[];
 #endif
 
 #if BUILDFLAG(ENABLE_OFFLINE_PAGES)
 extern const char kOfflinePrefetchBackoff[];
 #endif
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_