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

chrome/installer/util/util_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 install related constants that need to be used by Chrome as
 // well as Chrome Installer.
 
 #ifndef CHROME_INSTALLER_UTIL_UTIL_CONSTANTS_H_
 #define CHROME_INSTALLER_UTIL_UTIL_CONSTANTS_H_
 
@@ skipping 235 matching lines @@
 // The range of error values for the installer, Courgette, and bsdiff is
 // overlapping. These offset values disambiguate between different sets
 // of errors by shifting the values up with the specified offset.
 const int kCourgetteErrorOffset = 300;
 const int kBsdiffErrorOffset = 600;
 
 // Arguments to --patch switch
 extern const char kCourgette[];
 extern const char kBsdiff[];
 
+// Name of the allocator (and associated file) for storing histograms to be
+// reported by Chrome during its next upload.
+extern const char kSetupHistogramAllocatorName[];
+
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_UTIL_UTIL_CONSTANTS_H_