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

device/screen_orientation/public/interfaces/screen_orientation.mojom

Index: device/screen_orientation/public/interfaces/screen_orientation.mojom
diff --git a/device/screen_orientation/public/interfaces/screen_orientation.mojom b/device/screen_orientation/public/interfaces/screen_orientation.mojom
index c54218843371fb8fb00356a0c42b2c0ab87a4897..074adbed3f757ca26a90d01191324031d21be6f3 100644
--- a/device/screen_orientation/public/interfaces/screen_orientation.mojom
+++ b/device/screen_orientation/public/interfaces/screen_orientation.mojom
@@ -26,4 +26,10 @@ interface ScreenOrientationListener {
   // 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);
 };