Update layout for gesture navigation

By request of gesture navigation, apps need make their contents
extand to nav bar and update nav bar color to transparent using
run time code to avoid RRO overwrite.
Refactor layout and add padding for some layout to avoid some UI
pop up nav bar or status bar position.

Bug: 127822515
Test: visual
Test: DocumentsUIGoogleTests
Change-Id: I8a7fcdfd83734084ed34228c2b20c31bdcbda394