Reset Bluetooth EventHandler when it is invalid

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 55 matching lines @@
   OBSOLETE_BLUETOOTH_ADAPTER_OFF = 7,
   CHOSEN_DEVICE_VANISHED = 8,
   BLUETOOTH_CHOOSER_CANCELLED = 9,
   BLUETOOTH_CHOOSER_DENIED_PERMISSION = 10,
   BLACKLISTED_SERVICE_IN_FILTER = 11,
   BLUETOOTH_OVERVIEW_HELP_LINK_PRESSED = 12,
   ADAPTER_OFF_HELP_LINK_PRESSED = 13,
   NEED_LOCATION_HELP_LINK_PRESSED = 14,
   BLUETOOTH_CHOOSER_POLICY_DISABLED = 15,
   BLUETOOTH_GLOBALLY_DISABLED = 16,
+  BLUETOOTH_CHOOSER_EVENT_HANDLER_INVALID = 17,
   // NOTE: Add new requestDevice() outcomes immediately above this line. Make
   // sure to update the enum list in
   // tools/metrics/histograms/histograms.xml accordingly.
   COUNT
 };
 
 // There should be a call to this function before every
 // Send(BluetoothMsg_RequestDeviceSuccess...) or
 // Send(BluetoothMsg_RequestDeviceError...).
 void RecordRequestDeviceOutcome(UMARequestDeviceOutcome outcome);

[Jeffrey Yasskin, 2016/08/08 16:48:38]

You'll have to mark this with CONTENT_EXPORT.

[juncai, 2016/08/08 18:42:39]

Done.

 
 // Records stats about the arguments used when calling requestDevice.
 //  - The number of filters used.
 //  - The size of each filter.
 //  - UUID of the services used in filters.
 //  - Number of optional services used.
 //  - UUID of the optional services.
 //  - Size of the union of all services.
 void RecordRequestDeviceOptions(
     const blink::mojom::WebBluetoothRequestDeviceOptionsPtr& options);
@@ skipping 174 matching lines @@
 // Send(BluetoothMsg_StopNotificationsError).
 void RecordStartNotificationsOutcome(UMAGATTOperationOutcome outcome);
 
 // Records the outcome of a cache query for startNotifications. Should only be
 // called if QueryCacheForCharacteristic fails.
 void RecordStartNotificationsOutcome(CacheQueryOutcome outcome);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BLUETOOTH_BLUETOOTH_METRICS_H_