Revert "Remove lag when launching an app"

This reverts commit 04b204d589b513f8fd13a29cc5db12a77126d879.
Revert "frameworks/base: Fix to avoid crash when the tab is not set from app"

This reverts commit e56677b06c7fbd66a265b017453b59437038d4d0.
Revert "FastScroller: Fix to use appropriate index"

This reverts commit ecc50515324079ba07b65e2246d867d6c48dbb13.
Revert "HeaderViewListAdapter: Correct thrown error names."

This reverts commit 934882e21c490b77918eccf1ae23e98c87abfd56.