Persist setup metrics and have Chrome report them during UMA upload.

chrome/installer/util/google_update_constants.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.
 
 // Defines all the command-line switches used with Google Update.
 
 #ifndef CHROME_INSTALLER_UTIL_GOOGLE_UPDATE_CONSTANTS_H_
 #define CHROME_INSTALLER_UTIL_GOOGLE_UPDATE_CONSTANTS_H_
 
 namespace google_update {
@@ skipping 58 matching lines @@
 extern const wchar_t kRegRLZReactivationBrandField[];
 extern const wchar_t kRegReferralField[];
 extern const wchar_t kRegRenameCmdField[];
 extern const wchar_t kRegRunAsUserField[];
 extern const wchar_t kRegSendsPingsField[];
 extern const wchar_t kRegUninstallCmdLine[];
 extern const wchar_t kRegUsageStatsField[];
 extern const wchar_t kRegVersionField[];
 extern const wchar_t kRegWebAccessibleField[];
 
-// last time that chrome ran in the Time internal format.
+// Last time that chrome ran in the Time internal format.
 extern const wchar_t kRegLastRunTimeField[];
 
 // The name of the value where Google Update reads the list of experiments for
 // itself and Chrome.
 extern const wchar_t kExperimentLabels[];
 
+// Name of allocator (and associated file) for storing histograms to be

[grt (UTC plus 2), 2015/12/18 21:02:50]

is this related to Chrome's integration with Google Update? if not,
util_constants.{cc,h} is a better place for it.

[bcwhite, 2015/12/21 15:47:25]

Done.

+// reported by Chrome during its next upload.
+extern const char kSetupHistogramAllocatorName[];
+
 }  // namespace google_update
 
 #endif  // CHROME_INSTALLER_UTIL_GOOGLE_UPDATE_CONSTANTS_H_