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This allows chrome://settings/inputMethods to show up-to-date IME
information without closing and reopening the settings window. For
example, when the language X is enabled on the device and a new
Chrome OS IME extension for the language X is installed, it'll
instantly show up in chrome://settings/inputMethods. The same happens
for Android IMEs installed via Play Store too.

BUG=867795,845079
TEST=Add 'Japanese' to the language list, open chrome://settings/inputMethods,
 install 'SKK Japanese Input' (extension IME) from Chrome Web Store, verify
 the IME entry ('SKK') shows up in the settings page immediately.
TEST=Go to extensions page, disable the SKK IME, verify 'SKK' disappears
 immediately.

Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I20f7586cd58e7d6c6f92f37c1f0b697d57d17d32
Reviewed-on: https://chromium-review.googlesource.com/1198106
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588233}