bluetooth: Move histogram related code to its own file

content/browser/bluetooth/bluetooth_metrics.h

Index: content/browser/bluetooth/bluetooth_metrics.h
diff --git a/content/browser/bluetooth/bluetooth_metrics.h b/content/browser/bluetooth/bluetooth_metrics.h
new file mode 100644
index 0000000000000000000000000000000000000000..3483d4c34fac3852498767ceefe3d8a81ae63152
--- /dev/null
+++ b/content/browser/bluetooth/bluetooth_metrics.h
@@ -0,0 +1,135 @@
+// 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 <vector>
+
+namespace base {
+class TimeDelta;
+}
+
+namespace device {
+class BluetoothUUID;
+}
+
+namespace content {
+struct BluetoothScanFilter;
+
+// General Metrics
+
+// Enumaration of each Web Bluetooth API entry point.
+enum class UMAWebBluetoothFunction {
+  REQUEST_DEVICE = 0,
+  CONNECT_GATT = 1,
+  GET_PRIMARY_SERVICE = 2,
+  GET_CHARACTERISTIC = 3,
+  CHARACTERISTIC_READ_VALUE = 4,
+  CHARACTERISTIC_WRITE_VALUE = 5,
+  // NOTE: Add new actions 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 for every call to the Web Bluetooth
+// API.
+void RecordWebBluetoothFunctionCall(UMAWebBluetoothFunction function);
+
+// requestDevice() Metrics
+enum class UMARequestDeviceOutcome {
+  SUCCESS = 0,
+  NO_BLUETOOTH_ADAPTER = 1,
+  NO_RENDER_FRAME = 2,
+  DISCOVERY_START_FAILED = 3,
+  DISCOVERY_STOP_FAILED = 4,
+  NO_MATCHING_DEVICES_FOUND = 5,
+  BLUETOOTH_ADAPTER_NOT_PRESENT = 6,
+  BLUETOOTH_ADAPTER_OFF = 7,
+  // 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);
+
+// 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 RecordRequestDeviceArguments(
+    const std::vector<content::BluetoothScanFilter>& filters,
+    const std::vector<device::BluetoothUUID>& optional_services);
+
+// connectGATT() Metrics
+enum class UMAConnectGATTOutcome {
+  SUCCESS = 0,
+  NO_DEVICE = 1,
+  UNKNOWN = 2,
+  IN_PROGRESS = 3,
+  FAILED = 4,
+  AUTH_FAILED = 5,
+  AUTH_CANCELED = 6,
+  AUTH_REJECTED = 7,
+  AUTH_TIMEOUT = 8,
+  UNSUPPORTED_DEVICE = 9,
+  // Note: Add new ConnectGATT 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_ConnectGATTSuccess) and
+// Send(BluetoothMsg_ConnectGATTError).
+void RecordConnectGATTOutcome(UMAConnectGATTOutcome outcome);
+// Records how long it took for the connection to succeed.
+void RecordConnectGATTTimeSuccess(const base::TimeDelta& duration);
+// Records how long it took for the connection to fail.
+void RecordConnectGATTTimeFailed(const base::TimeDelta& duration);
+
+// getPrimaryService() Metrics
+enum class UMAGetPrimaryServiceOutcome {
+  SUCCESS = 0,
+  NO_DEVICE = 1,
+  NOT_FOUND = 2,
+  // Note: Add new GetPrimaryService outcomes immediately above this line.
+  // Make sure to update the enum list in
+  // 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);
+
+// 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_