Combine boolean MediaDeviceNotifications histograms to an enumerated histogram.

chrome/browser/system_monitor/removable_device_notifications_mac.mm

 // 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/system_monitor/removable_device_notifications_mac.h"
 
 #include "content/public/browser/browser_thread.h"
 
 namespace chrome {
 
@@ skipping 94 matching lines @@
       base::SystemMonitor::Get()->ProcessRemovableStorageDetached(
           it->second.device_id());
     }
   }
 
   if (update_type == UPDATE_DEVICE_REMOVED) {
     if (it != disk_info_map_.end())
       disk_info_map_.erase(it);
   } else {
     disk_info_map_[info.bsd_name()] = info;
+    MediaStorageUtil::RecordDeviceInfoHistogram(true, info.device_id(),
+                                                info.display_name());
     if (ShouldPostNotificationForDisk(info)) {
       base::SystemMonitor::Get()->ProcessRemovableStorageAttached(
           info.device_id(), info.display_name(), info.mount_point().value());
     }
   }
 }
 
 bool RemovableDeviceNotificationsMac::GetDeviceInfoForPath(
     const FilePath& path,
     base::SystemMonitor::RemovableStorageInfo* device_info) const {
@@ skipping 69 matching lines @@
       it = disk_info_map_.begin(); it != disk_info_map_.end(); ++it) {
     if (it->second.mount_point() == mount_point) {
       *info = it->second;
       return true;
     }
   }
   return false;
 }
 
 }  // namespace chrome