Bluetooth: Don't attempt a pairing for devices not supporting it.

device/bluetooth/bluetooth_device.h

 // Copyright (c) 2012 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 DEVICE_BLUETOOTH_BLUETOOTH_DEVICE_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_DEVICE_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 147 matching lines @@
   // be a synthesied string containing the address and localized type name
   // if the device has no obtained name.
   virtual string16 GetName() const;
 
   // Returns the type of the device, limited to those we support or are
   // aware of, by decoding the bluetooth class information. The returned
   // values are unique, and do not overlap, so DEVICE_KEYBOARD is not also
   // DEVICE_PERIPHERAL.
   DeviceType GetDeviceType() const;
 
+  // Indicates whether the device is known to support pairing based on its
+  // device class and address.
+  bool IsPairable() const;
+
   // Indicates whether the device is paired with the adapter.
   virtual bool IsPaired() const = 0;
 
   // Indicates whether the device is currently connected to the adapter.
   virtual bool IsConnected() const = 0;
 
   // Indicates whether the paired device accepts connections initiated from the
   // adapter. This value is undefined for unpaired devices.
   virtual bool IsConnectable() const = 0;
 
@@ skipping 144 matching lines @@
 
  private:
   // Returns a localized string containing the device's bluetooth address and
   // a device type for display when |name_| is empty.
   string16 GetAddressWithLocalizedDeviceTypeName() const;
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_DEVICE_H_