Add persisted preference for projection touch HUD

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 299 matching lines @@
 extern const char kPowerLidClosedAction[];
 extern const char kPowerUseAudioActivity[];
 extern const char kPowerUseVideoActivity[];
 extern const char kPowerAllowScreenWakeLocks[];
 extern const char kPowerPresentationScreenDimDelayFactor[];
 extern const char kPowerUserActivityScreenDimDelayFactor[];
 extern const char kTermsOfServiceURL[];
 extern const char kUsedPolicyCertificatesOnce[];
 extern const char kAttestationEnabled[];
 extern const char kAttestationExtensionWhitelist[];
+extern const char kTouchHudProjectionEnabled[];
 #endif  // defined(OS_CHROMEOS)
 extern const char kIpcDisabledMessages[];
 extern const char kShowHomeButton[];
 extern const char kRecentlySelectedEncoding[];
 extern const char kDeleteBrowsingHistory[];
 extern const char kDeleteDownloadHistory[];
 extern const char kDeleteCache[];
 extern const char kDeleteCookies[];
 extern const char kDeletePasswords[];
 extern const char kDeleteFormData[];
@@ skipping 600 matching lines @@
 extern const char kAppListAppLaunchCount[];
 
 extern const char kModuleConflictBubbleShown[];
 
 extern const char kDRMSalt[];
 extern const char kEnableDRM[];
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_