Fix invalid suggestion window position on ChromeOS and Windwos.

Fix invalid suggestion window position on ChromeOS and Windwos.

This is regression from
http://crrev.com/dac0c7af14c29c9d8509b775d5044e5448b6263b
The show_ime_if_needed is one shot message so we can't use it as a
trigger of monitoring composition bounding box, since we need
to keep monitoring during the text input session is active.

BUG=640012
Review-Url: https://codereview.chromium.org/2330423002
Cr-Commit-Position: refs/heads/master@{#418491}
(cherry picked from commit 14f15f11744445a7adb34030719afeb41a9432d0)

Committed: https://chromium.googlesource.com/chromium/src/+/26e487a3d8add5a2c4e969565ac7c488c959d906

[Seigo Nonaka, 2016-09-20 01:30:18]

Description was changed from

==========
Fix invalid suggestion window position on ChromeOS and Windwos.

This is regression from
http://crrev.com/dac0c7af14c29c9d8509b775d5044e5448b6263b
The show_ime_if_needed is one shot message so we can't use it as a
trigger of monitoring composition bounding box, since we need
to keep monitoring during the text input session is active.

BUG=640012

Review-Url: https://codereview.chromium.org/2330423002
Cr-Commit-Position: refs/heads/master@{#418491}
(cherry picked from commit 14f15f11744445a7adb34030719afeb41a9432d0)
==========

to

==========
Fix invalid suggestion window position on ChromeOS and Windwos.

This is regression from
http://crrev.com/dac0c7af14c29c9d8509b775d5044e5448b6263b
The show_ime_if_needed is one shot message so we can't use it as a
trigger of monitoring composition bounding box, since we need
to keep monitoring during the text input session is active.

BUG=640012

Review-Url: https://codereview.chromium.org/2330423002
Cr-Commit-Position: refs/heads/master@{#418491}
(cherry picked from commit 14f15f11744445a7adb34030719afeb41a9432d0)

Committed:
https://chromium.googlesource.com/chromium/src/+/26e487a3d8add5a2c4e969565ac7...
==========

[Seigo Nonaka, 2016-09-20 01:30:20]

Committed patchset #1 (id:1) manually as
26e487a3d8add5a2c4e969565ac7c488c959d906.