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In the case of Japanese, IME shows word usage or its description. This
feature is already supported in Chrome OS native ibus IME engines.
With this patch, Chrome supports same feature for Extension IME.

This change does not affect existing extension implementation in terms of
backward compatibility.

BUG=158486
TEST=manually done one lumpy.


Review URL: https://chromiumcodereview.appspot.com/11412268

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@170670 0039d316-1c4b-4281-b951-d872f2087c98