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

device/bluetooth/dbus/bluetooth_gatt_attribute_value_delegate.cc

Index: device/bluetooth/dbus/bluetooth_gatt_attribute_value_delegate.cc
diff --git a/device/bluetooth/dbus/bluetooth_gatt_attribute_value_delegate.cc b/device/bluetooth/dbus/bluetooth_gatt_attribute_value_delegate.cc
new file mode 100644
index 0000000000000000000000000000000000000000..238dc6e4fee199e4ae496f0c38813699ed81b02a
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+++ b/device/bluetooth/dbus/bluetooth_gatt_attribute_value_delegate.cc
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+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "device/bluetooth/dbus/bluetooth_gatt_attribute_value_delegate.h"
+
+#include "dbus/object_path.h"
+#include "device/bluetooth/bluez/bluetooth_adapter_bluez.h"
+#include "device/bluetooth/bluez/bluetooth_device_bluez.h"
+#include "device/bluetooth/bluez/bluetooth_local_gatt_service_bluez.h"
+
+namespace bluez {
+
+BluetoothGattAttributeValueDelegate::BluetoothGattAttributeValueDelegate(
+    BluetoothLocalGattServiceBlueZ* service)
+    : service_(service) {}
+
+BluetoothGattAttributeValueDelegate::~BluetoothGattAttributeValueDelegate() {}
+
+device::BluetoothDevice* BluetoothGattAttributeValueDelegate::GetDeviceWithPath(
+    const dbus::ObjectPath& object_path) {
+  return service_->GetAdapter()->GetDeviceWithPath(object_path);
+}
+
+}  // namespace bluez