Bluetooth: gather usage metrics

device/bluetooth/bluetooth_adapter_experimental_chromeos.cc

 // Copyright (c) 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 "device/bluetooth/bluetooth_adapter_experimental_chromeos.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/logging.h"
+#include "base/metrics/histogram.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/experimental_bluetooth_adapter_client.h"
 #include "chromeos/dbus/experimental_bluetooth_device_client.h"
 #include "chromeos/dbus/experimental_bluetooth_input_client.h"
 #include "device/bluetooth/bluetooth_device.h"
 #include "device/bluetooth/bluetooth_device_experimental_chromeos.h"
 
 using device::BluetoothAdapter;
 using device::BluetoothDevice;
 
@@ skipping 225 matching lines @@
           GetProperties(object_path);
 
   if (property_name == properties->bluetooth_class.name() ||
       property_name == properties->address.name() ||
       property_name == properties->alias.name() ||
       property_name == properties->paired.name() ||
       property_name == properties->trusted.name() ||
       property_name == properties->connected.name() ||
       property_name == properties->uuids.name())
     NotifyDeviceChanged(device_chromeos);
+
+  // UMA connection counting
+  if (property_name == properties->connected.name()) {
+    int count = 0;
+
+    for (DevicesMap::iterator iter = devices_.begin();
+         iter != devices_.end(); ++iter) {
+      if (iter->second->IsConnected())
+        ++count;
+    }
+
+    UMA_HISTOGRAM_COUNTS_100("Bluetooth.ConnectedDeviceCount", count);
+  }
 }
 
 void BluetoothAdapterExperimentalChromeOS::InputPropertyChanged(
     const dbus::ObjectPath& object_path,
     const std::string& property_name) {
   BluetoothDeviceExperimentalChromeOS* device_chromeos =
       GetDeviceWithPath(object_path);
   if (!device_chromeos)
     return;
 
@@ skipping 143 matching lines @@
 void BluetoothAdapterExperimentalChromeOS::OnStopDiscoveryError(
     const ErrorCallback& error_callback,
     const std::string& error_name,
     const std::string& error_message) {
   LOG(WARNING) << object_path_.value() << ": Failed to stop discovery: "
                << error_name << ": " << error_message;
   error_callback.Run();
 }
 
 }  // namespace chromeos