[sqlite] Backport icuCaseFunc16 patch from SQLite.

[sqlite] Backport icuCaseFunc16 patch from SQLite.

Original Chromium CL at https://codereview.chromium.org/1704103002

"Fix sqlite3's handling of casemapping result 3 times as long as
input"

SQLite interpretation at
http://www.sqlite.org/src/info/b8dc1b9f5d413000

"Fix a potential buffer overflow in the ICU upper() function."

The upstream change handles an empty input string while the original
Chromium CL (mine) does not. (bug 594478).

This is a copy of the CL by shess at
   https://codereview.chromium.org/1746453002/ .

BUG=586079, 594478
TEST=https://jsfiddle.net/ym2nuaj2/3/ (from bug 594478 comment 1)
TBR=shess@chromium.org

Review URL: https://codereview.chromium.org/1866753005

Cr-Commit-Position: refs/heads/master@{#385621}
(cherry picked from commit a8f7233f06c51fcec01dbacf92dfe7c1ec14c25f)

Committed: https://chromium.googlesource.com/chromium/src/+/e6f2e355e6cb7dde3b1e913cd0bc732ba694ef95

[jungshik at Google, 2016-04-12 20:52:36]

Description was changed from

==========
[sqlite] Backport icuCaseFunc16 patch from SQLite.

Original Chromium CL at https://codereview.chromium.org/1704103002

"Fix sqlite3's handling of casemapping result 3 times as long as
input"

SQLite interpretation at
http://www.sqlite.org/src/info/b8dc1b9f5d413000

"Fix a potential buffer overflow in the ICU upper() function."

The upstream change handles an empty input string while the original
Chromium CL (mine) does not. (bug 594478).

This is a copy of the CL by shess at
   https://codereview.chromium.org/1746453002/ .

BUG=586079, 594478
TEST=https://jsfiddle.net/ym2nuaj2/3/ (from bug 594478 comment 1)
TBR=shess@chromium.org

Review URL: https://codereview.chromium.org/1866753005

Cr-Commit-Position: refs/heads/master@{#385621}
(cherry picked from commit a8f7233f06c51fcec01dbacf92dfe7c1ec14c25f)
==========

to

==========
[sqlite] Backport icuCaseFunc16 patch from SQLite.

Original Chromium CL at https://codereview.chromium.org/1704103002

"Fix sqlite3's handling of casemapping result 3 times as long as
input"

SQLite interpretation at
http://www.sqlite.org/src/info/b8dc1b9f5d413000

"Fix a potential buffer overflow in the ICU upper() function."

The upstream change handles an empty input string while the original
Chromium CL (mine) does not. (bug 594478).

This is a copy of the CL by shess at
   https://codereview.chromium.org/1746453002/ .

BUG=586079, 594478
TEST=https://jsfiddle.net/ym2nuaj2/3/ (from bug 594478 comment 1)
TBR=shess@chromium.org

Review URL: https://codereview.chromium.org/1866753005

Cr-Commit-Position: refs/heads/master@{#385621}
(cherry picked from commit a8f7233f06c51fcec01dbacf92dfe7c1ec14c25f)

Committed:
https://chromium.googlesource.com/chromium/src/+/e6f2e355e6cb7dde3b1e913cd0bc...
==========

[jungshik at Google, 2016-04-12 20:52:38]

Committed patchset #1 (id:1) manually as
e6f2e355e6cb7dde3b1e913cd0bc732ba694ef95.