UMA stats for MTP file system in Chrome OS Files.app.

chrome/browser/chromeos/file_manager/volume_manager.cc

 // Copyright 2013 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/file_manager/volume_manager.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/memory/singleton.h"
+#include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chromeos/drive/drive_integration_service.h"
 #include "chrome/browser/chromeos/drive/file_errors.h"
 #include "chrome/browser/chromeos/drive/file_system_interface.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
 #include "chrome/browser/chromeos/file_manager/mounted_disk_monitor.h"
 #include "chrome/browser/chromeos/file_manager/path_util.h"
 #include "chrome/browser/chromeos/file_manager/volume_manager_factory.h"
 #include "chrome/browser/chromeos/file_manager/volume_manager_observer.h"
@@ skipping 80 matching lines @@
     case VOLUME_TYPE_MOUNTED_ARCHIVE_FILE:
       return "archive";
     case VOLUME_TYPE_CLOUD_DEVICE:
       return "cloud_device";
     case VOLUME_TYPE_PROVIDED:
       return "provided";
     case VOLUME_TYPE_MTP:
       return "mtp";
     case VOLUME_TYPE_TESTING:
       return "testing";
+    case NUM_VOLUME_TYPE:
+      break;
   }
   NOTREACHED();
   return "";
 }
 
 // Generates a unique volume ID for the given volume info.
 std::string GenerateVolumeId(const VolumeInfo& volume_info) {
   // For the same volume type, base names are unique, as mount points are
   // flat for the same volume type.
   return (VolumeTypeToString(volume_info.type) + ":" +
@@ skipping 670 matching lines @@
     if (!from_current_profile)
       return;
   }
 
   // Filter out removable disks if forbidden by policy for this profile.
   if (volume_info.type == VOLUME_TYPE_REMOVABLE_DISK_PARTITION &&
       profile_->GetPrefs()->GetBoolean(prefs::kExternalStorageDisabled)) {
     return;
   }
 
-  if (error_code == chromeos::MOUNT_ERROR_NONE || volume_info.mount_condition)
+  if (error_code == chromeos::MOUNT_ERROR_NONE || volume_info.mount_condition) {
     mounted_volumes_[volume_info.volume_id] = volume_info;
 
+    if (!is_remounting) {
+      UMA_HISTOGRAM_ENUMERATION("FileBrowser.VolumeType",
+                                volume_info.type,
+                                NUM_VOLUME_TYPE);
+    }
+  }
+
   FOR_EACH_OBSERVER(VolumeManagerObserver,
                     observers_,
                     OnVolumeMounted(error_code, volume_info, is_remounting));
 }
 
 void VolumeManager::DoUnmountEvent(chromeos::MountError error_code,
                                    const VolumeInfo& volume_info) {
   if (mounted_volumes_.find(volume_info.volume_id) == mounted_volumes_.end())
     return;
   if (error_code == chromeos::MOUNT_ERROR_NONE)
     mounted_volumes_.erase(volume_info.volume_id);
 
   FOR_EACH_OBSERVER(VolumeManagerObserver,
                     observers_,
                     OnVolumeUnmounted(error_code, volume_info));
 }
 
 }  // namespace file_manager