Add component for feature engagement tracking.

chrome/common/chrome_constants.cc

 // 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.
 
 #include "chrome/common/chrome_constants.h"
 
 #include "build/build_config.h"
 #include "chrome/common/chrome_version.h"
 
 #define FPL FILE_PATH_LITERAL
@@ skipping 127 matching lines @@
 const base::FilePath::CharType kCookieFilename[] = FPL("Cookies");
 const base::FilePath::CharType kCRLSetFilename[] =
     FPL("Certificate Revocation Lists");
 const base::FilePath::CharType kCustomDictionaryFileName[] =
     FPL("Custom Dictionary.txt");
 const base::FilePath::CharType kExtensionActivityLogFilename[] =
     FPL("Extension Activity");
 const base::FilePath::CharType kExtensionsCookieFilename[] =
     FPL("Extension Cookies");
 const base::FilePath::CharType kFirstRunSentinel[] = FPL("First Run");
+const base::FilePath::CharType kFeatureEngagementTrackerStorageDirname[] =

[sky, 2017/03/31 00:10:15]

keep sorted (move above kFirstRunSentinel, which you have correctly in the .h).

[nyquist, 2017/03/31 00:15:40]

Oops! Thanks! Done.

+    FPL("Feature Engagement Tracker");
 const base::FilePath::CharType kGCMStoreDirname[] = FPL("GCM Store");
 const base::FilePath::CharType kLocalStateFilename[] = FPL("Local State");
 const base::FilePath::CharType kLocalStorePoolName[] = FPL("LocalStorePool");
 const base::FilePath::CharType kMediaCacheDirname[] = FPL("Media Cache");
 const base::FilePath::CharType kNetworkPersistentStateFilename[] =
     FPL("Network Persistent State");
 const base::FilePath::CharType kOfflinePageArchivesDirname[] =
     FPL("Offline Pages/archives");
 const base::FilePath::CharType kOfflinePageMetadataDirname[] =
     FPL("Offline Pages/metadata");
@@ skipping 52 matching lines @@
 // user can select for different file types.
 // {2676A9A2-D919-4FEE-9187-152100393AB2}
 const char kApplicationClientIDStringForAVScanning[] =
     "2676A9A2-D919-4FEE-9187-152100393AB2";
 
 const size_t kMaxMetaTagAttributeLength = 2000;
 
 }  // namespace chrome
 
 #undef FPL