DeviceOrientation API on ChromeOS

content/public/browser/sensor_manager_delegate_chromeos.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 CONTENT_PUBLIC_BROWSER_SENSOR_MANAGER_DELEGATE_CHROMEOS_H_
+#define CONTENT_PUBLIC_BROWSER_SENSOR_MANAGER_DELEGATE_CHROMEOS_H_
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+typedef base::Callback<void(double x, double y, double z)>
+    OrientationDataCallback;
+
+// For platforms with a push API for accelerometer sensors this delegate can be
+// implemented. Once notified to start fetching data, the callback provided can
+// be used to send the data.
+class CONTENT_EXPORT SensorManagerDelegateChromeOS {
+ public:
+  virtual ~SensorManagerDelegateChromeOS();
+
+  // Allows platforms to provide a delegate.
+  static void SetDelegate(SensorManagerDelegateChromeOS* delegate);
+
+  // Start processing accelerometer events for orientation. The values can be
+  // passed via |callback|
+  virtual void StartFetchingDeviceOrientationData(
+      const OrientationDataCallback& callback) = 0;
+
+  // Stop processing accelerometer events for orientation.
+  virtual void StopFetchingDeviceOrientationData() = 0;
+
+ protected:
+  SensorManagerDelegateChromeOS();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SensorManagerDelegateChromeOS);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_SENSOR_MANAGER_DELEGATE_CHROMEOS_H_