- Extracted MessageListFragment out of the MessageList activity.
- This is basically pure extraction, with the following conceptual change.
- Now the MessageList activity doesn't know the mailbox id or
the account id. If it needs these ids, it needs to ask the fragment.
- MessageListFragment.LoadMessagesTask tries to determine the account ID
if it's unknown.
Most code in MessageListFragment is directly copied from MessageList
with minimal changes (e.g. pass mActivity instead of 'this' as a Context).
There's a few cleaning up oppotunities. I'll work on them later in a separate
CL.
Change-Id: Ie004cc49b429f2cd8f9de73df5abb94f3054ea0a
