Implements part of Device Motion in the Renderer

content/browser/device_orientation/motion_message_filter.h

Index: content/browser/device_orientation/motion_message_filter.h
diff --git a/content/browser/device_orientation/motion_message_filter.h b/content/browser/device_orientation/motion_message_filter.h
new file mode 100644
index 0000000000000000000000000000000000000000..64a1a9ee5a0acb480e32bc950f6a2f38f7519438
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+++ b/content/browser/device_orientation/motion_message_filter.h
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+// 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.
+
+#ifndef CONTENT_BROWSER_DEVICE_ORIENTATION_MOTION_MESSAGE_FILTER_H_
+#define CONTENT_BROWSER_DEVICE_ORIENTATION_MOTION_MESSAGE_FILTER_H_
+
+#include <map>
+
+#include "content/browser/device_orientation/provider.h"
+#include "content/public/browser/browser_message_filter.h"
+
+namespace device_orientation {
+
+class MotionMessageFilter : public content::BrowserMessageFilter {
+ public:
+  MotionMessageFilter();
+
+  // content::BrowserMessageFilter implementation.
+  virtual bool OnMessageReceived(const IPC::Message& message,
+                                 bool* message_was_ok) OVERRIDE;
+
+ private:
+  virtual ~MotionMessageFilter();
+
+  void OnStartUpdating(int render_view_id);
+  void OnStopUpdating(int render_view_id);
+
+  // Helper classes that observe a Provider and forward updates to a RenderView.
+  class MotionObserverDelegate;
+  class OrientationObserverDelegate;
+
+  // map from render_view_id to MotionObserverDelegate.
+  std::map<int, scoped_refptr<MotionObserverDelegate> > observers_map_;
+
+  scoped_refptr<Provider> provider_;
+
+  DISALLOW_COPY_AND_ASSIGN(MotionMessageFilter);
+};
+
+}  // namespace device_orientation
+
+#endif  // CONTENT_BROWSER_DEVICE_ORIENTATION_MOTION_MESSAGE_FILTER_H_