Increase wallpaper crashtime

Change-Id: Id640ca2b7b889e718c9f5acb71da97c5f3dbbc05
Speedup DropBox Service

*Needs Drobpox Intergrate Upload and Download Tests

Change-Id: Ic6f812120ee0a08ef2abe933397e3d2873e6c4a6
wallpapercropper: OOM issue while opening *.bmp image

This change manages setting of large images as
wallpapers without encountering OOM.

CRs-fixed: 619815
Change-Id: I3a32ec4b42050b146076f0adf6b6e65afd6fae4e