[PointerLock] Suggest on the new UI for user authorization for Pointer Lock API

[xingri]

As shared through the Chrome Blog, upcoming chrome release will add the user prompt for the Pointer Lock & Keyboard Lock API.

From the contents provider's stand point, we hope to have the consistent interfaces across browsers.

• Need to provide consistent mechanism to determine whether the User prompt required or not.
• Need to have the consistent setting UI for guiding the users to allow the permission for the Pointer Lock.