[Media controls] Integrate rotate-to-fullscreen with orientation lock

device/screen_orientation/public/interfaces/screen_orientation.mojom

 // Copyright 2016 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.
 
 module device.mojom;
 
 import "device/screen_orientation/public/interfaces/screen_orientation_lock_types.mojom";
 
 interface ScreenOrientation {
   LockOrientation(ScreenOrientationLockType orientation) =>
     (ScreenOrientationLockResult result);
   UnlockOrientation();
 };
 
 // ScreenOrientationListener is expected to be used when the platform requires
 // heavy work in order to accurately know the screen orientation.
 // For example, on Android, this is required for Jelly Bean, where there is no
 // API to be notified of a screen orientation change of 180 degrees.
 interface ScreenOrientationListener {
   // The renderer process is now using the Screen Orientation API and informs
   // the browser process that it should start accurately listening to the screen
   // orientation if it wasn't already.
   Start();
   
   // The renderer process is no longer using the Screen Orientation API and
   // informs the browser process that it can stop accurately listening to the
   // screen orientation if no other process cares about it.
   Stop();
+
+  // Queries whether accelerometer auto rotation of screen orientation is
+  // enabled, or the user has locked the screen orientation at the OS level.
+  // This can be called at any time, whether or not the listener is started.
+  // It's currently only implemented on Android.
+  IsAutoRotateEnabledByUser() => (bool enabled);
 };