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The OnInputMethodOptionsUpdated event is fire when any change is made
to the input method specific settings in pref so that ime extension can
reload options immediately.

We register an observer in input method engine, and whenever we observe
the change, we check settings of which input method is changed and then
fire the event with that input method code.

Test: tested in Chrome on Linux, added browser tests.
Bug: 1042084
Change-Id: I4971b838f3a3b0eff32ad454f19d273e6804ef3c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2257119
Commit-Queue: Jing Wang <jiwan@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Reviewed-by: Keith Lee <keithlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786630}