Refactors DeviceOrientation to make it more extensible

content/browser/device_orientation/device_data.cc

+// Copyright (c) 2012 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.
+
+#include <cmath>
+
+#include "content/browser/device_orientation/device_data.h"
+
+namespace device_orientation {
+
+bool DeviceData::IsElementSignificantlyDifferent(bool can_provide_element1,
+    bool can_provide_element2, double element1, double element2) {
+  const double kThreshold = 0.1;
+
+  if (can_provide_element1 != can_provide_element2)
+    return true;
+  if (can_provide_element1 && std::fabs(element1 - element2) >= kThreshold)
+    return true;
+  return false;
+}
+
+}  // namespace device_orientation