Read and expose accelerometer values from cros-ec-accel trigger.

ash/accelerometer/accelerometer_observer.h

+// Copyright 2014 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 ASH_ACCELEROMETER_ACCELEROMETER_OBSERVER_H_
+#define ASH_ACCELEROMETER_ACCELEROMETER_OBSERVER_H_
+
+namespace gfx {
+class Vector3dF;
+}
+
+namespace ash {
+
+// The interface for classes which observe accelerometer updates.
+class AccelerometerObserver {
+ public:
+  virtual void OnAccelerometerUpdated(const gfx::Vector3dF& base,
+                                      const gfx::Vector3dF& lid) = 0;
+
+ protected:
+  virtual ~AccelerometerObserver() {}
+};
+
+}  // namespace ash
+
+#endif  // ASH_ACCELEROMETER_ACCELEROMETER_OBSERVER_H_