Check if activity is in pip mode then use system brightness.
Don't force to store brightness while returning from pip mode. Since it contains system brightness.
Brightness changes affect only when player is in full-screen (landscape) mode.
Store brightness value to shared preferences which can be restored for later use.
Create interface `PlayerGestureOptions` that defines all controlles.
`PlayerGestureController` takes this as listner and call apropriate method.
Double tap events are also called from this class.
