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There are a number of ways for selecting an element in a tested html page, and those involve
injecting javascript. This class is intended to be used for abstracting this js generation
to diminish the proliferation of ad-hoc code.

Bug: None
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ifbe1ba8be509dfe3ab02ff8b7ddca6cefc3761ff
Reviewed-on: https://chromium-review.googlesource.com/1118160
Commit-Queue: Eric Noyau <noyau@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571069}