bluetooth: Add adapter to BluetoothDevice

device/bluetooth/bluetooth_device.h

Index: device/bluetooth/bluetooth_device.h
diff --git a/device/bluetooth/bluetooth_device.h b/device/bluetooth/bluetooth_device.h
index 09d179777ac7a088d1654151b8ffb7ff2857bf15..67948f800b92fb36ca8e046a080e3717b5652435 100644
--- a/device/bluetooth/bluetooth_device.h
+++ b/device/bluetooth/bluetooth_device.h
@@ -23,6 +23,7 @@ class BinaryValue;
 
 namespace device {
 
+class BluetoothAdapter;
 class BluetoothGattConnection;
 class BluetoothGattService;
 class BluetoothSocket;
@@ -430,7 +431,7 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothDevice {
   static std::string CanonicalizeAddress(const std::string& address);
 
  protected:
-  BluetoothDevice();
+  BluetoothDevice(BluetoothAdapter* adapter);
 
   // Returns the internal name of the Bluetooth device, used by GetName().
   virtual std::string GetDeviceName() const = 0;
@@ -442,6 +443,10 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothDevice {
   void SetServiceData(BluetoothUUID serviceUUID, const char* buffer,
                       size_t size);
 
+  // Raw pointer to adapter owning this device object. Subclasses use platform
+  // specific pointers via adapter_.
+  BluetoothAdapter* adapter_;
+
   // Mapping from the platform-specific GATT service identifiers to
   // BluetoothGattService objects.
   typedef std::map<std::string, BluetoothGattService*> GattServiceMap;