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All interactive views implement GetAccessibleState
to provide accessibility information about the current
state of the view. This struct now includes a callback
that can be used to change the string value, since
automation software wants to fill in text fields,
and this interface is implemented for Textfield
and LocationBarView, and hooked up to put_accValue.

BUG=260266

Review URL: https://chromiumcodereview.appspot.com/23441024

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221688 0039d316-1c4b-4281-b951-d872f2087c98