Move some functions from web_bluetooth_service_impl.cc to BluetoothDevice class

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 296449601cb9c683fa572e1031d664412323da78..bf145c9ad7e081dd9ab17361fa026c2991ca3188 100644
--- a/device/bluetooth/bluetooth_device.h
+++ b/device/bluetooth/bluetooth_device.h
@@ -31,6 +31,7 @@ namespace device {
 
 class BluetoothAdapter;
 class BluetoothGattConnection;
+class BluetoothRemoteGattCharacteristic;
 class BluetoothSocket;
 class BluetoothUUID;
 
@@ -555,6 +556,15 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothDevice {
   // Return associated BluetoothAdapter.
   BluetoothAdapter* GetAdapter() { return adapter_; }
 
+  std::vector<BluetoothRemoteGattCharacteristic*> GetCharacteristicsByUUID(
+      const std::string& service_instance_id,
+      const BluetoothUUID& characteristic_uuid);
+
+  std::vector<BluetoothRemoteGattService*> GetPrimaryServicesByUUID(

[scheib, 2017/01/07 01:42:36]

In Bluetooth concepts, the Services come before Characteristics, so I would
prefer to order these methods with Services first, then Characteristics. 

[juncai, 2017/01/09 19:29:19]

Done.

+      const BluetoothUUID& service_uuid);
+
+  std::vector<BluetoothRemoteGattService*> GetPrimaryServices();
+
  protected:
   // BluetoothGattConnection is a friend to call Add/RemoveGattConnection.
   friend BluetoothGattConnection;