Refactors DeviceOrientation to make it more extensible

content/browser/device_orientation/accelerometer_mac.cc

Index: content/browser/device_orientation/accelerometer_mac.cc
diff --git a/content/browser/device_orientation/accelerometer_mac.cc b/content/browser/device_orientation/accelerometer_mac.cc
index bdc42786f84fe2a0c670e6844057bab7921eef79..181589a45d16c8d97b05408415849d6450316c05 100644
--- a/content/browser/device_orientation/accelerometer_mac.cc
+++ b/content/browser/device_orientation/accelerometer_mac.cc
@@ -24,6 +24,15 @@ AccelerometerMac::~AccelerometerMac() {
 AccelerometerMac::AccelerometerMac() {
 }
 
+bool AccelerometerMac::GetDeviceData(DeviceData* device_data) {
+  switch (device_data->device_data_type()) {
+    case DeviceData::kDeviceOrientationData:
+      return GetOrientation(static_cast<Orientation*>(device_data));
+    default:
+      return false;
+  }
+}
+
 //  Retrieve per-axis orientation values.
 //
 //  Axes and angles are defined according to the W3C DeviceOrientation Draft.