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Implemented a first version of grammar check client, which just throw
the entire requested text to grammar service and if it returns with any
suggestion other than the original text, we will mark the whole sentence
and show the suggestion in context menu.

Design doc of the feature: go/cros-grammar
Screenshot of the feature:
https://screenshot.googleplex.com/BqkRhx6BYC2LPiF

This feature is ChromeOS only and is hidden behind a by-default disabled
flag. When the flag is enabled, and when enhanced spell check is
enabled, we will call grammar check when enhanced spell checker detects
no spell errors and display grammar error if we find any.

It is not ideal to always check the entire input and mark the whole
sentence. The feature is to be improved in the follow-up CLs, but I
think this is good enough as a first version.

Bug: 1132699
Test: tested on DUT
Change-Id: Ie2a8ca99e2f6910e9eef6bb3c7eb5da980a4db92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2585245
Commit-Queue: Jing Wang <jiwan@chromium.org>
Reviewed-by: Tim Volodine <timvolodine@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840062}