Implement Device Orientation using shared memory in content/renderer.

content/browser/device_orientation/device_orientation_message_filter.h

Index: content/browser/device_orientation/device_orientation_message_filter.h
diff --git a/content/browser/device_orientation/device_orientation_message_filter.h b/content/browser/device_orientation/device_orientation_message_filter.h
new file mode 100644
index 0000000000000000000000000000000000000000..b8ccb84a49c4de024ff34d8c4e8d7544d88e4a38
--- /dev/null
+++ b/content/browser/device_orientation/device_orientation_message_filter.h
@@ -0,0 +1,37 @@
+// Copyright 2013 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_DEVICE_ORIENTATION_MESSAGE_FILTER_H_
+#define CONTENT_BROWSER_DEVICE_ORIENTATION_DEVICE_ORIENTATION_MESSAGE_FILTER_H_
+
+#include "base/compiler_specific.h"
+#include "content/public/browser/browser_message_filter.h"
+
+namespace content {
+
+class RenderProcessHost;
+
+class DeviceOrientationMessageFilter : public BrowserMessageFilter {
+ public:
+  DeviceOrientationMessageFilter();
+
+  // BrowserMessageFilter implementation.
+  virtual bool OnMessageReceived(const IPC::Message& message,
+                                 bool* message_was_ok) OVERRIDE;
+
+ private:
+  virtual ~DeviceOrientationMessageFilter();
+
+  void OnDeviceOrientationStartPolling();
+  void OnDeviceOrientationStopPolling();
+  void DidStartDeviceOrientationPolling();
+
+  bool is_started_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeviceOrientationMessageFilter);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_DEVICE_ORIENTATION_DEVICE_ORIENTATION_MESSAGE_FILTER_H_