Pipe UiTranslationSpec through to the UiTranslationController.

And use it to conditionally enable content padding for requested views.

Fix: 179693024
Test: atest android.translation.cts.UiTranslationManagerTest
Test: adb shell dumpsys activity <ACTIVITY> --translation
Change-Id: I23fb29a60525d736f2dcf9d11b548c62332c412c