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

chrome/installer/util/google_update_constants.h

Index: chrome/installer/util/google_update_constants.h
diff --git a/chrome/installer/util/google_update_constants.h b/chrome/installer/util/google_update_constants.h
index f55268bdd6e2202d76335f062bb03d21f8df0711..1df282d3f284e92b4fc3400eaac425742cd6c15a 100644
--- a/chrome/installer/util/google_update_constants.h
+++ b/chrome/installer/util/google_update_constants.h
@@ -76,13 +76,17 @@ 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_