Add initial Blink-side support for the Screen Orientation API

Source/modules/screen_orientation/ScreenOrientationController.cpp

+// 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 "config.h"
+#include "ScreenOrientationController.h"
+
+#include "modules/screen_orientation/ScreenOrientationClient.h"
+
+namespace WebCore {
+
+ScreenOrientationController::ScreenOrientationController(ScreenOrientationClient* client)
+    : m_client(client)
+    , m_orientation(OrientationPortraitPrimary)
+{
+}
+
+PassOwnPtr<ScreenOrientationController> ScreenOrientationController::create(ScreenOrientationClient* client)
+{
+    return adoptPtr(new ScreenOrientationController(client));
+}
+
+void ScreenOrientationController::addObserver(ScreenOrientation* observer)
+{
+    m_observers.add(observer);
+}
+
+void ScreenOrientationController::removeObserver(ScreenOrientation* observer)
+{
+    if (!m_observers.contains(observer))
+        return;
+
+    m_observers.remove(observer);
+}
+
+const char* ScreenOrientationController::supplementName()
+{
+    return "ScreenOrientationController";
+}
+
+ScreenOrientationClient* ScreenOrientationController::clientFrom(Page* page)
+{
+    if (ScreenOrientationController* controller = ScreenOrientationController::from(page))
+        return controller->client();
+    return 0;
+}
+
+void ScreenOrientationController::orientationChanged(ScreenOrientationValue orientation)
+{
+    if (m_orientation == orientation)
+        return;
+
+    m_orientation = orientation;
+    for (ObserversSet::iterator it = m_observers.begin(); it != m_observers.end(); ++it)
+        (*it)->orientationChanged();
+}
+
+void provideScreenOrientation(Page* page, ScreenOrientationClient* client)
+{
+    ScreenOrientationController::provideTo(page, ScreenOrientationController::supplementName(), ScreenOrientationController::create(client));
+}
+
+} // namespace WebCore