Add UMA for the number of devices in the chooser when a device is paired

content/browser/bluetooth/bluetooth_metrics.h

 // Copyright 2015 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.
 
 #ifndef CONTENT_BROWSER_BLUETOOTH_BLUETOOTH_METRICS_H_
 #define CONTENT_BROWSER_BLUETOOTH_BLUETOOTH_METRICS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 276 matching lines @@
   // Note: Add new RSSI signal strength level immediately above this line.
   COUNT
 };
 
 // Records the raw RSSI, and processed result displayed to users, when
 // content::BluetoothDeviceChooserController::CalculateSignalStrengthLevel() is
 // called.
 void RecordRSSISignalStrength(int rssi);
 void RecordRSSISignalStrengthLevel(UMARSSISignalStrengthLevel level);
 
+// In the case of not accepting all devices in the options that are given
+// to WebBluetooth requestDevice(), records the number of devices in the
+// chooser when a device is paired.
+void RecordNumOfDevices(bool accept_all_devices, size_t num_of_devices);
+
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BLUETOOTH_BLUETOOTH_METRICS_H_