Welcome page changes for Windows 10 and over.

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 666 matching lines @@
 
 extern const char kChromeOsReleaseChannel[];
 
 extern const char kPerformanceTracingEnabled[];
 
 extern const char kTabStripStackedLayout[];
 
 extern const char kRegisteredBackgroundContents[];
 
 #if defined(OS_WIN)
+extern const char kLastWelcomedOSVersion[];
 extern const char kShownAutoLaunchInfobar[];
+extern const char kWelcomePageOnOSUpgradeEnabled[];
 #endif
 
 extern const char kAuthSchemes[];
 extern const char kDisableAuthNegotiateCnameLookup[];
 extern const char kEnableAuthNegotiatePort[];
 extern const char kAuthServerWhitelist[];
 extern const char kAuthNegotiateDelegateWhitelist[];
 extern const char kGSSAPILibraryName[];
 extern const char kAuthAndroidNegotiateAccountType[];
 extern const char kAllowCrossOriginAuthPrompt[];
@@ skipping 124 matching lines @@
 
 #if defined(ENABLE_EXTENSIONS)
 extern const char kAnimationPolicy[];
 #endif
 
 extern const char kBackgroundTracingLastUpload[];
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_