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This CL uses the new |GetStringAttribute| web-action to get the required
attribute for matching. It extends the previously |value| only action
to also support |innerText|.

This CL adds the support for |SelectorProto.TextFilter| as the RE2
enabled filter criterium.

Bug: b/169924567
Change-Id: I182504434c7769674f6b9ddecc98d74cb57a4f4e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2464265
Commit-Queue: Sandro Maggi <sandromaggi@google.com>
Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Reviewed-by: Luca Hunkeler <hluca@google.com>
Cr-Commit-Position: refs/heads/master@{#816563}