ChromeOS: Allow partial (uptime only) Uptime.Logout UMA metrics.

chrome/browser/chromeos/boot_times_loader.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/browser/chromeos/boot_times_loader.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 127 matching lines @@
   Stats stats;
   // Callers of this method expect synchronous behavior.
   // It's safe to allow IO here, because only virtual FS are accessed.
   base::ThreadRestrictions::ScopedAllowIO allow_io;
   base::ReadFileToString(kProcUptime, &stats.uptime_);
   base::ReadFileToString(kDiskStat, &stats.disk_);
   return stats;
 }
 
 std::string BootTimesLoader::Stats::SerializeToString() const {
-  if (uptime_.empty() || disk_.empty())
+  if (uptime_.empty() && disk_.empty())
     return std::string();
   base::DictionaryValue dictionary;
   dictionary.SetString(kUptime, uptime_);
   dictionary.SetString(kDisk, disk_);
 
   std::string result;
   if (!base::JSONWriter::Write(&dictionary, &result)) {
     LOG(WARNING) << "BootTimesLoader::Stats::SerializeToString(): failed.";
     return std::string();
   }
@@ skipping 361 matching lines @@
           GetRenderWidgetHost(&web_contents->GetController());
       render_widget_hosts_loading_.erase(render_widget_host);
       break;
     }
     default:
       break;
   }
 }
 
 }  // namespace chromeos