Combine boolean MediaDeviceNotifications histograms to an enumerated histogram.

chrome/browser/system_monitor/removable_device_notifications_linux.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.
 
 // RemovableDeviceNotificationsLinux implementation.
 
 #include "chrome/browser/system_monitor/removable_device_notifications_linux.h"
 
 #include <libudev.h>
 #include <mntent.h>
@@ skipping 417 matching lines @@
     mount_info_map_[mount_point] =
         mount_info_map_.find(other_mount_point)->second;
     return;
   }
 
   std::string unique_id;
   string16 name;
   bool removable;
   get_device_info_func_(mount_device, &unique_id, &name, &removable);
 
-
-  // Keep track of device uuid, to see how often we receive empty values.
-  UMA_HISTOGRAM_BOOLEAN("MediaDeviceNotification.DeviceUUIDAvailable",
-                        !unique_id.empty());
-  UMA_HISTOGRAM_BOOLEAN("MediaDeviceNotification.DeviceNameAvailable",
-                        !name.empty());
+  // Keep track of device info details to see how often we get invalid values.
+  MediaStorageUtil::RecordDeviceInfoHistogram(true, unique_id, name);
   if (unique_id.empty() || name.empty())
     return;
 
   bool has_dcim = IsMediaDevice(mount_point.value());
   MediaStorageUtil::Type type;
   if (removable) {
     if (has_dcim) {
       type = MediaStorageUtil::REMOVABLE_MASS_STORAGE_WITH_DCIM;
     } else {
       type = MediaStorageUtil::REMOVABLE_MASS_STORAGE_NO_DCIM;
@@ skipping 11 matching lines @@
   mount_info_map_[mount_point] = mount_point_info;
   mount_priority_map_[mount_device][mount_point] = removable;
 
   if (removable) {
     SystemMonitor::Get()->ProcessRemovableStorageAttached(device_id, name,
                                                           mount_point.value());
   }
 }
 
 }  // namespace chrome