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The feature was previously created under the IME service, I refactored
it by moving it to ChromeOS features for a simple structure and
passing it to the IME extension. This feature is used for switching
whether the IME component extension is able to connect to IME service.

Bug: 837156,880245
Change-Id: I832b60e1bcc90708771a935dc9f3172067eb8544
Reviewed-on: https://chromium-review.googlesource.com/1209131Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: Leo Zhang <googleo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589835}