Initial sensor event provider for testing views screen rotation

content/common/sensors_listener.h

Index: content/common/sensors_listener.h
diff --git a/content/common/sensors_listener.h b/content/common/sensors_listener.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_COMMON_SENSORS_LISTENER_H_
+#define CONTENT_COMMON_SENSORS_LISTENER_H_
+#pragma once
+
+#include "content/common/sensors.h"
+
+// The sensors API will unify various types of sensor data into a set of
+// channels, each of which provides change events and periodic updates.
+//
+// This version of the API is intended only to support the experimental screen
+// rotation code and is not for general use. In particular, the final listener
+// will declare generic |OnSensorChanged| and |OnSensorUpdated| methods, rather
+// than the special-purpose |OnScreenOrientationChanged|.
+
+namespace sensors {
+
+class Listener {
+ public:
+  // Called whenever the coarse orientation of the device changes.
+  virtual void OnScreenOrientationChanged(const ScreenOrientation& change) = 0;
+
+ protected:
+  virtual ~Listener() {}
+};
+
+}  // namespace sensors
+
+#endif  // CONTENT_COMMON_SENSORS_LISTENER_H_