lenaback: Fix Details parallax on different screen resolution

DetailsFragment is using absolute value for aligning overview row.
Make parallax also use absolute value.
Fix NPE in CompositeDrawable Property when get() is called before set().
Fix NPE in DetailsTestFragment delayed handler.

Test: passed unit test on API 19, API 23, API 24 with different
      resolutions
Bug: 31771962

Change-Id: Id97c0649f7c851cf9906c42aa607ecc55ce4ef20
4 files changed