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With this change, it becomes possible to filter element by computed CSS
property, for example, to find button that has not been hidden using
CSS, do:
  filters { css_selector: "button" }
  filters {
    css_style {
      property: "visibility"
      value { re2: "visible" }
    }
  }

The implementation is based on window.getComputedStyle.

Bug: b/171464032
Change-Id: Ic89219f969c614258edabec91705e9c37348138c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2498484
Commit-Queue: Stephane Zermatten <szermatt@chromium.org>
Reviewed-by: Clemens Arbesser <arbesser@google.com>
Cr-Commit-Position: refs/heads/master@{#821238}