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 46f8a0576839d260d37f51976881d71c58aaf36a..5e1e6059d68536832a667295211077d07ed101f3 100644
--- a/device/bluetooth/bluetooth_device.h
+++ b/device/bluetooth/bluetooth_device.h
@@ -22,6 +22,7 @@ class BinaryValue;
 
 namespace device {
 
+class BluetoothAdapter;
 class BluetoothGattConnection;
 class BluetoothGattService;
 class BluetoothSocket;
@@ -429,7 +430,7 @@ 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;
@@ -441,6 +442,10 @@ 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;