A recent change had the contacts reloaded every time a new field
is touched. This change not only fixes the problem, but also removes
reloading contacts when changing language, which should make language
switch within LatinIME lighter.

Bug: 5125034
Change-Id: Ia61c4f75a8617113cdce88a2e2c6fdf073146a2d

Bug: 4590281
Change-Id: I37016dd066efa1463077c67e05218148cbb67df4

Bug: 4586840
Change-Id: I6dbef2d973174fc49c3955547dde923d6fa48ae1

Picking a suggestion inserts a space after the word. This change makes
this space a magic space.

Incidentally, do some minor cleanup: add CODE_DASH, CODE_SINGLE_QUOTE
and CODE_DOUBLE_QUOTE to Keyboard and use them throughout the code,
and remove a useless import directive in some unrelated file.

Bug: 4319740

Change-Id: I245f396c34dd0af820bca91edc4ec363238a4ae4

bug: 4346034

Change-Id: Ibc3c27ca92ed61f1f689df3e90e2eb60fa0cbd33

This change also cleanups compiler warnings.

Bug: 2897373
Change-Id: If972cf45c1eb40436adbddbf71969e5409f4c9c5

bug: 2895391
Change-Id: I3a0628942b74556f8b600b63ebc5d808fb2f0abd

TODO: Cleanup will follow.

Change-Id: I4a68ba9f2f55760aa24187f1f13fdfa8a0b70963

-UnitTest for UserBigram
-Changes for number of bigrams to load

Change-Id: I2c6fbe6194d34112ccc52c7e199461d2350e8516

- retrieve bigrams that only starts with character typed and neighbor keys
- contacts bigram
- performance measure

bug: 2873133

Change-Id: If97c005b18c82f3fafef50009dd2dfd972b0ab8f

- Added counters for suggestions by dictionarys
- Added a counter for cancelled suggestions

Change-Id: Ia7d3a73855b1e82b60a010f18dba4e1c0fe1c2bb

This is to avoid ANRs during bootup, as some of the providers
may not have been initialized yet.

Refactored the ContactsDictionary and moved the async loading
code to ExpandableDictionary to share with the other dicts.

Bug: 2501133
Change-Id: I20393edb6fdf5df2f54ebac8dd04419a592177a2

Move java code to a different directory so that the unbundled
version doesn't try to compile the native code again.

Change-Id: I05cf9e643824ddc448821f69805ccb0240c5b986

This increases the chance of hitting the correct letter when typing a word
that exists in the dictionary, rather than only correct it after the fact.
It is most effective after 2 or 3 letters of a word have been typed and gets
more accurate with more typed letters in the word.

If 2 adjacent letters have similar probabilities of occuring, then there is no
hit correction applied.

I think the cause for this is the Contacts database being updated. This
causes the keyboard to reload the contacts once every 30 minutes. Since it
loads it synchronously, it affects people with several thousand contacts.

Although in my tests, with 3000 contacts, the delay was only 600ms, I've
had several reports from long-time googlers about this problem, so I'm
switching to loading the contacts asynchronously in a background thread.

Also fix a potential problem with capitalizing "i" if a contact has "i" as
one of the names.

Contacts dictionary code was being triggered too frequently during sync and
during presence updates and this seems expensive for accounts with a lot of
contacts.

Throttling the contacts read to every 30 minutes.

Bug 2021966

Bug 1597304

First pass at automatically adding new words that the user types and deliberately
accepts.
After typing the word 4 times, the word gets promoted to being valid.
After typing the word 7 times, the word gets added into the UserDictionary and can
be removed from the UserDictionary Settings UI.

Also add a second row of symbols to the period popup.