Revert "Revert "Refactoring DetailsBackgroundParallaxHelper.""

This reverts commit 6eebd92660979650cbde3b9d303099cff3015a23.

Test: DetailsFragmentTest, DetailsParallaxManagerTest
Change-Id: I86a3ef75b862a60f7dcef037e7d4eebcaa488785
17 files changed