Add DBus plumbing and tests for sending devices with ATT read/writes.

device/bluetooth/test/bluetooth_test_bluez.h

Index: device/bluetooth/test/bluetooth_test_bluez.h
diff --git a/device/bluetooth/test/bluetooth_test_bluez.h b/device/bluetooth/test/bluetooth_test_bluez.h
index ee10ef7e55584436e2ed0da157c90de09a6eab08..32fcec963117901ed6bac604b13475aca0c192c8 100644
--- a/device/bluetooth/test/bluetooth_test_bluez.h
+++ b/device/bluetooth/test/bluetooth_test_bluez.h
@@ -35,19 +35,23 @@ class BluetoothTestBlueZ : public BluetoothTestBase {
   void InitWithFakeAdapter() override;
   BluetoothDevice* SimulateLowEnergyDevice(int device_ordinal) override;
   void SimulateLocalGattCharacteristicValueReadRequest(
+      BluetoothDevice* from_device,
       BluetoothLocalGattCharacteristic* characteristic,
       const BluetoothLocalGattService::Delegate::ValueCallback& value_callback,
       const base::Closure& error_callback) override;
   void SimulateLocalGattCharacteristicValueWriteRequest(
+      BluetoothDevice* from_device,
       BluetoothLocalGattCharacteristic* characteristic,
       const std::vector<uint8_t>& value_to_write,
       const base::Closure& success_callback,
       const base::Closure& error_callback) override;
   void SimulateLocalGattDescriptorValueReadRequest(
+      BluetoothDevice* from_device,
       BluetoothLocalGattDescriptor* descriptor,
       const BluetoothLocalGattService::Delegate::ValueCallback& value_callback,
       const base::Closure& error_callback) override;
   void SimulateLocalGattDescriptorValueWriteRequest(
+      BluetoothDevice* from_device,
       BluetoothLocalGattDescriptor* descriptor,
       const std::vector<uint8_t>& value_to_write,
       const base::Closure& success_callback,