Sync the DeviceOrientation and DeviceMotion interfaces with the spec

third_party/WebKit/Source/modules/device_orientation/DeviceOrientationEvent.idl

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+// http://w3c.github.io/deviceorientation/spec-source-orientation.html#deviceorientation
+
+// TODO(philipj): DeviceOrientationEvent should have a constructor.
 interface DeviceOrientationEvent : Event {
     readonly attribute double? alpha;
     readonly attribute double? beta;
     readonly attribute double? gamma;
+    // TODO(philipj): absolute should not be nullable.
     readonly attribute boolean? absolute;
+
+    // TODO(philipj): The init*Event() methods are not in the spec:
+    // https://github.com/w3c/deviceorientation/issues/18
     [Measure] void initDeviceOrientationEvent([Default=Undefined] optional DOMString type,
                                               [Default=Undefined] optional boolean bubbles,
                                               [Default=Undefined] optional boolean cancelable,
                                               [Default=Undefined] optional double? alpha,
                                               [Default=Undefined] optional double? beta,
                                               [Default=Undefined] optional double? gamma,
                                               [Default=Undefined] optional boolean? absolute);
 };