Reland: Introduce the devices Mojo app

device/devices_app/devices_apptest.cc

Index: device/devices_app/devices_apptest.cc
diff --git a/device/devices_app/devices_apptest.cc b/device/devices_app/devices_apptest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4416bda68a5d9881e05a700fd97dd3cb0db9741e
--- /dev/null
+++ b/device/devices_app/devices_apptest.cc
@@ -0,0 +1,56 @@
+// Copyright 2015 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 "base/bind.h"
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/run_loop.h"
+#include "device/devices_app/devices_app.h"
+#include "device/devices_app/usb/public/interfaces/device_manager.mojom.h"
+#include "mojo/application/public/cpp/application_impl.h"
+#include "mojo/application/public/cpp/application_test_base.h"
+
+namespace device {
+namespace {
+
+class DevicesAppTest : public mojo::test::ApplicationTestBase {
+ public:
+  DevicesAppTest() {}
+  ~DevicesAppTest() override {}
+
+  void SetUp() override {
+    ApplicationTestBase::SetUp();
+    mojo::URLRequestPtr request = mojo::URLRequest::New();
+    request->url = "mojo:devices";
+    application_impl()->ConnectToService(request.Pass(), &usb_device_manager_);
+  }
+
+  usb::DeviceManager* usb_device_manager() { return usb_device_manager_.get(); }
+
+ private:
+  usb::DeviceManagerPtr usb_device_manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(DevicesAppTest);
+};
+
+void OnGetDevices(const base::Closure& continuation,
+                  mojo::Array<usb::DeviceInfoPtr> devices) {
+  continuation.Run();
+}
+
+}  // namespace
+
+// Simple test to verify that we can connect to the USB DeviceManager and get
+// a response.
+TEST_F(DevicesAppTest, GetUSBDevices) {
+  base::RunLoop loop;
+  usb::EnumerationOptionsPtr options = usb::EnumerationOptions::New();
+  options->filters = mojo::Array<usb::DeviceFilterPtr>(1);
+  options->filters[0] = usb::DeviceFilter::New();
+  usb_device_manager()->GetDevices(
+      options.Pass(), base::Bind(&OnGetDevices, loop.QuitClosure()));
+  loop.Run();
+}
+
+}  // namespace device