Swipe to refresh for empty conversation list

- Enable swipe to refresh when conversation list is empty by moving
the "empty_view" text view to be a child of ConversationListView, and
override the onTouchEvent of that TextView to always return true, so
"move" touch events get dispatched.
- Animate the pull to refresh hint text up over action bar (instead of fade).
- Change font and color of hint text per latest UX spec
- Disable swipe to refresh in CAB mode

Bug 8653364

Change-Id: I9a017d39e942e2ffebcf257e697b93515c161ee4
5 files changed