Add GetConnectionInfo function for BluetoothDevice, replacing the existing

chromeos/dbus/bluetooth_device_client.h

Index: chromeos/dbus/bluetooth_device_client.h
diff --git a/chromeos/dbus/bluetooth_device_client.h b/chromeos/dbus/bluetooth_device_client.h
index a09b4ef528a5800dc87ddcace2648afcbb29b078..312258d678e201134f6425a8ff2f1ac2b12f22b6 100644
--- a/chromeos/dbus/bluetooth_device_client.h
+++ b/chromeos/dbus/bluetooth_device_client.h
@@ -80,20 +80,6 @@ class CHROMEOS_EXPORT BluetoothDeviceClient : public DBusClient {
     // discovered during inquiry. Read-only.
     dbus::Property<int16> rssi;
 
-    // Received signal strength indicator when a connection is open to the
-    // device. This property is not set unless connection monitor is enabled.
-    // Read-only.
-    dbus::Property<int16> connection_rssi;
-
-    // The transmit power level of the host when a connection is open
-    // to the device. This property is not set unless connection monitor is
-    // enabled. Read-only.
-    dbus::Property<int16> connection_tx_power;
-
-    // The maximum transmit power level of the host that can be set
-    // when connected to the device. Read-only.
-    dbus::Property<int16> connection_tx_power_max;
-
     Properties(dbus::ObjectProxy* object_proxy,
                const std::string& interface_name,
                const PropertyChangedCallback& callback);
@@ -184,18 +170,18 @@ class CHROMEOS_EXPORT BluetoothDeviceClient : public DBusClient {
                              const base::Closure& callback,
                              const ErrorCallback& error_callback) = 0;
 
-  // Starts connection monitor for the device with object path
-  // |object_path|. Connection monitor is a mode the connection properties,
-  // RSSI and TX power are tracked and updated when they change.
-  virtual void StartConnectionMonitor(const dbus::ObjectPath& object_path,
-                                      const base::Closure& callback,
-                                      const ErrorCallback& error_callback) = 0;
-
-  // Stops connection monitor for the device with object path
-  // |object_path|.
-  virtual void StopConnectionMonitor(const dbus::ObjectPath& object_path,
-                                     const base::Closure& callback,
-                                     const ErrorCallback& error_callback) = 0;
+  // The callback invoked for as successful GetConnInfo API call with the
+  // RSSI, TX power, and maximum TX power of the current connection.
+  typedef base::Callback<void(int16 rssi,
+                              int16 transmit_power,
+                              int16 max_transmit_power)> ConnInfoCallback;
+
+  // Returns the RSSI, TX power, and maximum TX power of a connection to the
+  // device with object path |object_path|. If the device is not connected, then
+  // an error will be returned.
+  virtual void GetConnInfo(const dbus::ObjectPath& object_path,
+                           const ConnInfoCallback& callback,
+                           const ErrorCallback& error_callback) = 0;
 
   // Creates the instance.
   static BluetoothDeviceClient* Create();