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

chrome/installer/setup/installer_crash_reporting.cc

 // Copyright 2015 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/installer/setup/installer_crash_reporting.h"
 
 #include <iterator>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 105 matching lines @@
 
   // Set up the metrics client id (a la child_process_logging::Init()).
   scoped_ptr<metrics::ClientInfo> client_info =
       GoogleUpdateSettings::LoadMetricsClientInfo();
   if (client_info)
     crash_keys::SetMetricsClientIdFromGUID(client_info->client_id);
 }
 
 size_t RegisterCrashKeys() {
   const base::debug::CrashKey kFixedKeys[] = {
+#if defined(OS_MACOSX) || defined(OS_WIN)

[grt (UTC plus 2), 2016/02/10 16:01:53]

stale line

     { crash_keys::kMetricsClientId, crash_keys::kSmallSize },
     { kCurrentVersion, crash_keys::kSmallSize },
     { kDistributionType, crash_keys::kSmallSize },
     { kIsMultiInstall, crash_keys::kSmallSize },
     { kIsSystemLevel, crash_keys::kSmallSize },
     { kOperation, crash_keys::kSmallSize },
 
     // This is a Windows registry key, which maxes out at 255 chars.
     // (kMediumSize actually maxes out at 252 chars on Windows, but potentially
     // truncating such a small amount is a fair tradeoff compared to using
@@ skipping 29 matching lines @@
 void SetCurrentVersionCrashKey(const base::Version* current_version) {
   if (current_version) {
     base::debug::SetCrashKeyValue(kCurrentVersion,
                                   current_version->GetString());
   } else {
     base::debug::ClearCrashKey(kCurrentVersion);
   }
 }
 
 }  // namespace installer