bluetooth: Add histograms and logging for getCharacteristic

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>
 
 namespace base {
 class TimeDelta;
 }
 
 namespace device {
 class BluetoothUUID;
 }
 
@@ skipping 86 matching lines @@
   // tools/metrics/histograms/histograms.xml accordingly.
   COUNT
 };
 // Record the service uuid used when calling getPrimaryService.
 void RecordGetPrimaryServiceService(const device::BluetoothUUID& service);
 // There should be a call to this function for every call to
 // Send(BluetoothMsg_GetPrimaryServiceSuccess) and
 // Send(BluetoothMsg_GetPrimaryServiceError).
 void RecordGetPrimaryServiceOutcome(UMAGetPrimaryServiceOutcome outcome);
 
+// getCharacteristic() Metrics
+enum class UMAGetCharacteristicOutcome {
+  SUCCESS = 0,
+  NO_DEVICE = 1,
+  NO_SERVICE = 2,
+  NOT_FOUND = 3,
+  // Note: Add new outcomes immediately above this line.
+  // Make sure to update the enum list in
+  // tools/metrisc/histogram/histograms.xml accordingly.
+  COUNT
+};
+// There should be a call to this function for every call to
+// Send(BluetoothMsg_GetCharacteristicSuccess) and
+// Send(BluetoothMsg_GetCharacteristicError).
+void RecordGetCharacteristicOutcome(UMAGetCharacteristicOutcome outcome);
+// Records the UUID of the characteristic used when calling getCharacteristic.
+void RecordGetCharacteristicCharacteristic(const std::string& characteristic);
+
 // read/write characteristics Metrics
 // TODO(ortuno): For now we are just copying over the code to record these
 // errors but a follow up CL will add a function for each operation.
 
 // These types of errors aren't as common. We log them to understand
 // how common they are and if we need to investigate more.
 enum class UMAGATTError {
   UNKNOWN = 0,
   FAILED = 1,
   IN_PROGRESS = 2,
   NOT_PAIRED = 3,
   // Note: Add new GATT Errors immediately above this line.
   // Make sure to update the enum list in
   // tools/metrics/histograms/histograms.xml accordingly.
   MAX_ERROR,
 };
 // Records the GATT Error the function returned.
 void RecordGATTError(UMAGATTError error);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BLUETOOTH_BLUETOOTH_METRICS_H_