Merge pull request #9088 from albertopq/contacts-first-chunk-imp

Bug 846895 - Improving contacts first chunk rendering time r=arcturus(cherry picked from commit a4d3b4317a751db49b27d92ce0c51579e9fbee4f)

Conflicts:
	apps/communications/contacts/js/contacts.js
	apps/communications/contacts/js/contacts_list.js