Bluetooth: gather usage metrics

device/bluetooth/bluetooth_device_experimental_chromeos.h

Index: device/bluetooth/bluetooth_device_experimental_chromeos.h
diff --git a/device/bluetooth/bluetooth_device_experimental_chromeos.h b/device/bluetooth/bluetooth_device_experimental_chromeos.h
index ff31ddb68f7eec2d9fde9fe3a72eb01ad6980366..68b25bd45db4f13f3d8c691b573273216cc226c6 100644
--- a/device/bluetooth/bluetooth_device_experimental_chromeos.h
+++ b/device/bluetooth/bluetooth_device_experimental_chromeos.h
@@ -76,6 +76,7 @@ class BluetoothDeviceExperimentalChromeOS
 
  private:
   friend class BluetoothAdapterExperimentalChromeOS;
+  friend class MetricsLog;
 
   BluetoothDeviceExperimentalChromeOS(
       BluetoothAdapterExperimentalChromeOS* adapter,
@@ -104,6 +105,9 @@ class BluetoothDeviceExperimentalChromeOS
                                 const ConfirmationCallback& callback) OVERRIDE;
   virtual void Cancel() OVERRIDE;
 
+  // Used by MetricsLog to obtain the device information.
+  std::string GetModalias() const;
+
   // Internal method to initiate a connection to this device, and methods called
   // by dbus:: on completion of the D-Bus method call.
   void ConnectInternal(const base::Closure& callback,
@@ -166,6 +170,11 @@ class BluetoothDeviceExperimentalChromeOS
   // pairing. Returns true if any callbacks were run, false if not.
   bool RunPairingCallbacks(Status status);
 
+  // Record the result of pairing as a UMA histogram metric; |success| should
+  // be true if pairing succeeded, and |false| if not - in which case
+  // |error_code| specifies the reason for failure.
+  void RecordPairingResult(bool success, ConnectErrorCode error_code);
+
   // Return the object path of the device; used by
   // BluetoothAdapterExperimentalChromeOS
   const dbus::ObjectPath& object_path() const { return object_path_; }
@@ -184,6 +193,10 @@ class BluetoothDeviceExperimentalChromeOS
   // Passkeys. Generally it is the object that owns this one.
   PairingDelegate* pairing_delegate_;
 
+  // Flag to indicate whether a pairing delegate method has been called during
+  // pairing.
+  bool pairing_delegate_used_;
+
   // During pairing this is set to an instance of a D-Bus agent object
   // intialized with our own class as its delegate.
   scoped_ptr<ExperimentalBluetoothAgentServiceProvider> agent_;