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Gets and displays string descriptor in both tree view and byte view.
Adds a button near to the string descriptor index fields to get the
string descriptor of this field. And adds input element and button to
end of page for querying string descriptor manually.


Bug: 928923
Change-Id: Ib4f7be251fcb9532e75b1adf9a31d37b22cb5029
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1534629
Commit-Queue: Nancy Li <nancyly@google.com>
Reviewed-by: Matt Reynolds <mattreynolds@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#650411}