This is nice for code simplicity, but it has a small adverse impact on
performance.

Bug: 13406701
Change-Id: I9316b3fe8d79b940fbd83cf1187c8c0d10b26c71

In tests, we create many instances of LatinIME, but we never
destroy them. That means we never close the dictionaries nor
the handlers.
This change calls onDestroy, which closes all dictionaries, and
adds some code to finish the handlers.

Change-Id: I942517a2a940c54256b08763f6b38f5b55809f55

Bug: 13940739
Change-Id: I2e377b56e4a74d36c7e0cea4ad4e8d9341eb7feb

Bug: 13941339
Change-Id: I501e69d8f28526e3791ee8a338345926ff1b9a4c

This is a follow up of I57df8ca12b

Change-Id: I6a73de1ddecaf39ba42e03956e022cf7a398c864

Bug: 13920900
Change-Id: I57df8ca12b0d8cc4bbca2372c0470dcae5b5cbfb

BUG: 13891796
Change-Id: I3565ca22aaf1d3cfce4f35999e2990b2df5157ef

Bug: 7531804
Change-Id: I183443779f8d9d472ac5e528e1d905366bd83c90

Bug: 13406701
Change-Id: I09edd822f5cc2446b324d41c76d835bcff1191e6

Change-Id: Ic1c4e1776071332e02c368055157124bb539d14e

srand() and its friends are supposed to be discouraged since C++14.
This CL replaces srand() with new C++11 random libraries.

Change-Id: If2c25158c88c674cd3fd6d891559a9e32283e19e

Change-Id: If97b9e9cc3bbaa4c7877991c11d7935626268ca3

Before:
(0)  670.00 (10.52%)
(1)  5530.00 (86.81%)
(2)  120.00 (1.88%)
Total 6370.00 (sum of others 6320.00)

After:
(0)  730.00 (11.06%)
(1)  5750.00 (87.12%)
(2)  100.00 (1.52%)
Total 6600.00 (sum of others 6580.00)

Bug: 13773693
Bug: 10701902
Bug: 9505397
Change-Id: Ie53640994180a7acabe05da544ab2166403e2394

Before:
(0)  470.00 (8.25%)
(1)  5160.00 (90.53%)
(2)  50.00 (0.88%)
(66)  10.00 (0.18%)
Total 5700.00 (sum of others 5690.00)

After:
(0)  670.00 (10.52%)
(1)  5530.00 (86.81%)
(2)  120.00 (1.88%)
Total 6370.00 (sum of others 6320.00)

Bug: 13773693
Bug: 10701902
Bug: 9505397

Change-Id: Ie168ac4ae0ca0e954512b08e3cc0f6399a3c163d

Bug: 13799846
Bug: 10701902
Bug: 9505397

Change-Id: I6c3f84f035f2310f2f7dfec4432ebdb6e50d5df0

Before:
(0)  660.00 (1.43%)
(1)  45320.00 (98.18%)
(2)  80.00 (0.17%)
Total 46160.00 (sum of others 46060.00)

After:
(0)  620.00 (1.34%)
(1)  45310.00 (98.05%)
(2)  130.00 (0.28%)
Total 46210.00 (sum of others 46060.00)

Change-Id: I936b639c50e15208aee999a929b33983c6caa59d

Change-Id: I867271665b3c595dc40ac63e93e68c87dc213d08

Bug: 13914988
Change-Id: Ifd497a6a1d2686490e388e10e391475e97e9c166

Change-Id: I067e91a1f899c1f83fd60adeae66495606812a95

If 1 character, then for sure !isGesture

Bug: 13406701
Change-Id: If8e9b080372eb8ddb15b8f97cce1399dc0c7f099

BUG: 11746191
Change-Id: I0b693c4b22793f6e8fd77a9f045f205aa8fe4050

Change-Id: I1e05c7fdbb757efef0e9407dc25482ef1115e49a

BUG: 11746191
Change-Id: I0218dd07dde1d09321009ea1497258fc4235a1e8

Bug: 13406708

Change-Id: I48e9fccedd9dcdc1a35ffe027745b58966a83315

Change-Id: Ifaf955ae896a18e5cbc9c1af5a1b7e15942eb886