Initial sensor event provider for testing views screen rotation

content/browser/sensors/sensors_provider_impl.cc

+// Copyright (c) 2011 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 "content/browser/sensors/sensors_provider_impl.h"
+
+#include "base/memory/singleton.h"
+
+namespace sensors {
+
+ProviderImpl* ProviderImpl::GetInstance() {
+  return Singleton<ProviderImpl>::get();
+}
+
+ProviderImpl::ProviderImpl()
+    : listeners_(new ListenerList()) {
+}
+
+ProviderImpl::~ProviderImpl() {
+}
+
+void ProviderImpl::AddListener(Listener* listener) {
+  listeners_->AddObserver(listener);
+}
+
+void ProviderImpl::RemoveListener(Listener* listener) {
+  listeners_->RemoveObserver(listener);
+}
+
+void ProviderImpl::ScreenOrientationChanged(
+    const ScreenOrientation& change) {
+  listeners_->Notify(&Listener::OnScreenOrientationChanged, change);
+}
+
+}  // namespace sensors