Chromium plumbing for Device Orientation.

chrome/browser/device_orientation/dispatcher_host.h

+// Copyright (c) 2010 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 CHROME_BROWSER_DEVICE_ORIENTATION_DISPATCHER_HOST_H_
+#define CHROME_BROWSER_DEVICE_ORIENTATION_DISPATCHER_HOST_H_
+
+#include <set>
+
+#include "base/ref_counted.h"
+#include "chrome/browser/device_orientation/provider.h"
+
+namespace IPC { class Message; }
+
+namespace device_orientation {
+
+class Orientation;
+
+class DispatcherHost : public base::RefCountedThreadSafe<DispatcherHost>,
+                       public Provider::Observer {
+ public:
+  explicit DispatcherHost(int process_id);
+  bool OnMessageReceived(const IPC::Message& msg, bool* msg_was_ok);
+
+  // From Provider::Observer.
+  virtual void OnOrientationUpdate(const Orientation& orientation);
+
+ private:
+  virtual ~DispatcherHost();
+  friend class base::RefCountedThreadSafe<DispatcherHost>;
+
+  void OnStartUpdating(int render_view_id);
+  void OnStopUpdating(int render_view_id);
+
+  int process_id_;
+  std::set<int> render_view_ids_;
+  scoped_refptr<Provider> provider_;
+
+  DISALLOW_COPY_AND_ASSIGN(DispatcherHost);
+};
+
+}  // namespace device_orientation
+
+#endif  // CHROME_BROWSER_DEVICE_ORIENTATION_DISPATCHER_HOST_H_