[Extensions] Add logic for when to show the toolbar redesign bubble.

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 396 matching lines @@
 extern const char kEasyUnlockEnabled[];
 extern const char kEasyUnlockPairing[];
 extern const char kEasyUnlockProximityRequired[];
 extern const char kEasyUnlockShowTutorial[];
 
 extern const char kZeroSuggestCachedResults[];
 
 #if defined(ENABLE_EXTENSIONS) && !defined(OS_ANDROID) && !defined(OS_IOS)
 extern const char kCopresenceAuthenticatedDeviceId[];
 extern const char kCopresenceAnonymousDeviceId[];
+extern const char kToolbarIconSurfacingBubbleAcknowledged[];
+extern const char kToolbarIconSurfacingBubbleLastShowTime[];
 #endif
 
 #if defined(ENABLE_WEBRTC)
 extern const char kWebRTCMultipleRoutesEnabled[];
 #endif
 
 // Local state prefs. Please add Profile prefs above instead.
 extern const char kCertRevocationCheckingEnabled[];
 extern const char kCertRevocationCheckingRequiredLocalAnchors[];
 extern const char kSSLVersionMin[];
@@ skipping 395 matching lines @@
 
 extern const char kRegisteredSupervisedUserWhitelists[];
 
 #if defined(ENABLE_EXTENSIONS)
 extern const char kAnimationPolicy[];
 #endif
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_