Multi-select to share Part 2

UI work to supprot multi-select. Long pressing starts selection mode.
For now, you can only share the contacts that you have selected.

Manual tests:
* Starting selection mode
* starting selection mode by long pressing the Me Profile
* RTL layout
* rotation in search mode
* rotation in selection mode
* typing on keyboard while in selection mode:
  $ adb shell input keyboard text 'this%sis%san%sexample' (should do nothing)
* press search key while in selection mode:
  $ adb shell input keyevent 84 (should do nothing)
* sharing contacts via multi selection

Bug: 19549465
Change-Id: If438bddfaaee1f69e4c888716f926abcd00ddbc6