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* Add `GetComputedRole` to Element in ChromeDriver

Bug: chromedriver:3507
Change-Id: Id3e3dc2fa99ca05286d17323c9c03cbf4f36ece7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416381Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Shengfa Lin <shengfa@google.com>
Reviewed-by: John Chen <johnchen@chromium.org>
Reviewed-by: Mathias Bynens <mathias@chromium.org>
Commit-Queue: Maksim Sadym <sadym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809890}