Initial sensor event provider for testing views screen rotation

content/common/sensors_listener.h

+// 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 "base/basictypes.h"
+#include "content/common/sensors.h"
+
+namespace sensors {
+
+// 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 |OnSensorChange| and |OnSensorUpdate| methods, rather
+// than the special-purpose |OnScreenOrientationChange|.
+//
+class Listener {
+ public:
+  // Called whenever the coarse orientation of the device changes.
+  virtual void OnScreenOrientationChange(const ScreenOrientation& change) = 0;
+
+ protected:
+  Listener() {}
+  virtual ~Listener() {}
+
+  DISALLOW_COPY_AND_ASSIGN(Listener);
+};
+
+}  // namespace sensors
+
+#endif  // CONTENT_COMMON_SENSORS_LISTENER_H_