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This new method is only used in Android platform autofill which
requires to report actual text field change.

BUG=734702

Change-Id: I0487132d998bfc2f7244c534712b7ab24a3206d1
Reviewed-on: https://chromium-review.googlesource.com/540099
Commit-Queue: Tao Bai <michaelbai@chromium.org>
Reviewed-by: Roger McFarlane <rogerm@chromium.org>
Reviewed-by: Selim Gurun <sgurun@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#481941}