Implement create attribute API functions for BTLE.

device/bluetooth/bluetooth_adapter.h

Index: device/bluetooth/bluetooth_adapter.h
diff --git a/device/bluetooth/bluetooth_adapter.h b/device/bluetooth/bluetooth_adapter.h
index a6df9c8341750825f69308f061d04a87219e12c0..a9224562426118cae2a0fa293fd8fef09dc7ae83 100644
--- a/device/bluetooth/bluetooth_adapter.h
+++ b/device/bluetooth/bluetooth_adapter.h
@@ -23,13 +23,13 @@
 #include "device/bluetooth/bluetooth_audio_sink.h"
 #include "device/bluetooth/bluetooth_device.h"
 #include "device/bluetooth/bluetooth_export.h"
-#include "device/bluetooth/bluetooth_local_gatt_service.h"
 
 namespace device {
 
 class BluetoothAdvertisement;
 class BluetoothDiscoveryFilter;
 class BluetoothDiscoverySession;
+class BluetoothLocalGattService;
 class BluetoothRemoteGattCharacteristic;
 class BluetoothRemoteGattDescriptor;
 class BluetoothRemoteGattService;
@@ -421,6 +421,11 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothAdapter
       const CreateAdvertisementCallback& callback,
       const CreateAdvertisementErrorCallback& error_callback) = 0;
 
+  // Returns the local GATT services associated with this adapter with the
+  // given identifier. Returns NULL if the service doesn't exist.
+  virtual BluetoothLocalGattService* GetGattService(
+      const std::string& identifier) const = 0;
+
   // The following methods are used to send various events to observers.
   void NotifyAdapterStateChanged(bool powered);
 #if defined(OS_CHROMEOS) || defined(OS_LINUX)