Initial sensor event provider for testing views screen rotation

content/common/sensors.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_H_
+#define CONTENT_COMMON_SENSORS_H_
+#pragma once
+
+// 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.
+
+namespace sensors {
+
+// Indicates the coarse orientation of the device.
+struct ScreenOrientation {
+  enum Side {
+    TOP = 0,     // The screen is in its normal orientation.
+    BOTTOM = 1,  // The screen is upside-down (180-degree rotation).
+    LEFT = 2,    // The right side of the screen is at the top.
+    RIGHT = 3,   // The left side of the screen is at the top.
+    FRONT = 4,   // The screen is laid flat, facing upward.
+    BACK = 5     // The screen is laid flat, facing downward.
+  };
+
+  // The side of the device which the user probably perceives as facing upward.
+  // This can be used to orient controls and content in a "natural" direction.
+  Side upward;
+};
+
+}  // namespace sensors
+
+#endif  // CONTENT_COMMON_SENSORS_H_