Add unit test for ArcBluetoothBridge and TypeConverter

components/arc/test/fake_bluetooth_instance.cc

+// 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 "components/arc/test/fake_bluetooth_instance.h"
+
+namespace arc {
+
+FakeBluetoothInstance::FakeBluetoothInstance() {}
+FakeBluetoothInstance::~FakeBluetoothInstance() {}
+
+FakeBluetoothInstance::GattDBResult::GattDBResult(
+    mojom::BluetoothAddressPtr&& remote_addr,
+    mojo::Array<mojom::BluetoothGattDBElementPtr>&& db)
+    : remote_addr_(std::move(remote_addr)), db_(std::move(db)) {}
+
+FakeBluetoothInstance::GattDBResult::~GattDBResult() {}
+
+FakeBluetoothInstance::LEDeviceFoundData::LEDeviceFoundData(
+    mojom::BluetoothAddressPtr&& addr,
+    int32_t rssi,
+    mojo::Array<mojom::BluetoothAdvertisingDataPtr>&& adv_data)
+    : addr_(std::move(addr)), rssi_(rssi), adv_data_(std::move(adv_data)) {}
+
+FakeBluetoothInstance::LEDeviceFoundData::~LEDeviceFoundData() {}
+
+void FakeBluetoothInstance::Init(mojom::BluetoothHostPtr host_ptr) {}
+
+void FakeBluetoothInstance::OnAdapterProperties(
+    mojom::BluetoothStatus status,
+    mojo::Array<mojom::BluetoothPropertyPtr> properties) {}
+
+void FakeBluetoothInstance::OnRemoteDeviceProperties(
+    mojom::BluetoothStatus status,
+    mojom::BluetoothAddressPtr address,
+    mojo::Array<mojom::BluetoothPropertyPtr> properties) {}
+
+void FakeBluetoothInstance::OnDeviceFound(

[rkc, 2016/06/19 18:45:43]

What does the actual OnDeviceFound method do? This might be exposing a bug. This
method apparently ends up getting called twice; once when the DeviceAdded
observer method is called, and then again when we do SendCachedDevices.

[puthik_chromium, 2016/06/22 23:38:54]

It's will send the list of known device to Android.

Use case 1: User does not run Bluetooth scan before log in
- Android asked Chrome to scan
- Chrome found new device.
- DeviceAdded() get called
- Chrome send that device data to Android via OndeviceFound

Use case 2: User already scans device before log in
- Android asked Chrome to scan
- SendCachedDevices() get called
- Chrome send cached devices data without need to scanning again.
- Additional device will send via DeviceAdded()

+    mojo::Array<mojom::BluetoothPropertyPtr> properties) {
+  device_found_data_.emplace_back(std::move(properties));
+}
+
+void FakeBluetoothInstance::OnDiscoveryStateChanged(
+    mojom::BluetoothDiscoveryState state) {}
+
+void FakeBluetoothInstance::OnBondStateChanged(
+    mojom::BluetoothStatus status,
+    mojom::BluetoothAddressPtr remote_addr,
+    mojom::BluetoothBondState state) {}
+
+void FakeBluetoothInstance::OnAclStateChanged(
+    mojom::BluetoothStatus status,
+    mojom::BluetoothAddressPtr remote_addr,
+    mojom::BluetoothAclState state) {}
+
+void FakeBluetoothInstance::OnLEDeviceFound(
+    mojom::BluetoothAddressPtr addr,
+    int32_t rssi,
+    mojo::Array<mojom::BluetoothAdvertisingDataPtr> adv_data) {
+  le_device_found_data_.emplace_back(
+      new LEDeviceFoundData(std::move(addr), rssi, std::move(adv_data)));
+}
+
+void FakeBluetoothInstance::OnLEConnectionStateChange(
+    mojom::BluetoothAddressPtr remote_addr,
+    bool connected) {}
+
+void FakeBluetoothInstance::OnSearchComplete(
+    mojom::BluetoothAddressPtr remote_addr,
+    mojom::BluetoothGattStatus status) {}
+
+void FakeBluetoothInstance::OnGetGattDB(
+    mojom::BluetoothAddressPtr remote_addr,
+    mojo::Array<mojom::BluetoothGattDBElementPtr> db) {
+  gatt_db_result_.emplace_back(
+      new GattDBResult(std::move(remote_addr), std::move(db)));
+}
+
+void FakeBluetoothInstance::OnServicesRemoved(
+    mojom::BluetoothAddressPtr remote_addr,
+    uint16_t start_handle,
+    uint16_t end_handle) {}
+
+void FakeBluetoothInstance::OnServicesAdded(
+    mojom::BluetoothAddressPtr remote_addr,
+    mojo::Array<mojom::BluetoothGattDBElementPtr> db) {}
+
+}  // namespace arc