Create Mojo service for locking/unlocking screen orientation.

content/browser/screen_orientation/screen_orientation_context.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 "content/browser/screen_orientation/screen_orientation_context.h"
+
+namespace content {
+
+ScreenOrientationContext::ScreenOrientationContext() {
+}
+
+ScreenOrientationContext::~ScreenOrientationContext() {
+}
+
+void ScreenOrientationContext::AddObserver(Observer* observer) {
+  observer_list_.AddObserver(observer);
+}
+
+void ScreenOrientationContext::RemoveObserver(Observer* observer) {
+  observer_list_.RemoveObserver(observer);
+}
+
+void ScreenOrientationContext::OnScreenOrientationChange() {
+  FOR_EACH_OBSERVER(Observer, observer_list_, OnScreenOrientationChange());
+}
+
+void ScreenOrientationContext::OnNewLockRequest() {
+  FOR_EACH_OBSERVER(Observer, observer_list_, OnNewLockRequest());
+}
+
+}  // namespace content