[DeviceService] Add service tests for VibrationManager.

device/vibration/vibration_manager_impl_default.cc

 // Copyright 2014 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 <stdint.h>
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "device/vibration/vibration_manager_impl.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 
 namespace device {
 
+int64_t VibrationManagerImpl::milli_seconds_for_testing_ = -1;
+bool VibrationManagerImpl::cancelled_for_testing_ = false;
+
 namespace {
 
 class VibrationManagerEmptyImpl : public mojom::VibrationManager {
  public:
   VibrationManagerEmptyImpl() {}
   ~VibrationManagerEmptyImpl() override {}
 
   void Vibrate(int64_t milliseconds, const VibrateCallback& callback) override {
+    VibrationManagerImpl::milli_seconds_for_testing_ = milliseconds;
     callback.Run();
   }
 
-  void Cancel(const CancelCallback& callback) override { callback.Run(); }
+  void Cancel(const CancelCallback& callback) override {
+    VibrationManagerImpl::cancelled_for_testing_ = true;
+    callback.Run();
+  }
 };
 
 }  // namespace
 
 // static
 void VibrationManagerImpl::Create(mojom::VibrationManagerRequest request) {
   mojo::MakeStrongBinding(base::MakeUnique<VibrationManagerEmptyImpl>(),
                           std::move(request));
 }
 
 }  // namespace device