Chromium plumbing for Screen Orientation API orientationchange events.

content/renderer/screen_orientation/screen_orientation_dispatcher.h

+// 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.
+
+#ifndef CONTENT_RENDERER_SCREEN_ORIENTATION_DISPATCHER_H_
+#define CONTENT_RENDERER_SCREEN_ORIENTATION_DISPATCHER_H_
+
+#include "base/macros.h"
+#include "content/public/renderer/render_process_observer.h"
+#include "third_party/WebKit/public/platform/WebScreenOrientation.h"
+
+namespace blink {
+class WebScreenOrientationListener;
+}
+
+namespace content {
+
+class RenderThread;
+
+// ScreenOrientationDispatcher listens to message from the browser process and
+// dispatch the orientation change ones to the WebScreenOrientationListener.
+class CONTENT_EXPORT ScreenOrientationDispatcher
+    : public RenderProcessObserver {
+ public:
+  explicit ScreenOrientationDispatcher(RenderThread*);
+  virtual ~ScreenOrientationDispatcher() {}
+
+  // RenderProcessObserver
+  virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE;
+
+  void setListener(blink::WebScreenOrientationListener* listener);
+
+ private:
+  void OnOrientationChange(blink::WebScreenOrientation orientation);
+
+  blink::WebScreenOrientationListener* listener_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScreenOrientationDispatcher);
+};
+
+}  // namespace content
+
+#endif // CONTENT_RENDERER_SCREEN_ORIENTATION_DISPATCHER_H_