Add stop casting button for output switch

This CL add a customize button to stop casting when media
is transferred to info device.

This CL include following change:
- Add new methods to PanelContent.java. Let panels to
  customize "see more button".
- MediaOutputPanel will check which device is used to
  transfer media currently. The customize button will
  shown on when transfer device is info device.
  Then user can use this button to stop casting.
- Add test case.

Bug: 147856563
Test: make -j42 RunSettingsRoboTests
Change-Id: I8b201a10339f39f1d938d99b5659a82014e5bb89