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Adding a list of new actions to the Captured Sites Automation framework,
as well as a measure to hide the geolocation dialog, and a measure to
dismiss modal beforeunload JavaScript dialogs.

Bug: 847905
Change-Id: Icb687ebc46a339c0ecc6be799200aac73b32b5ae
Reviewed-on: https://chromium-review.googlesource.com/1207892
Commit-Queue: Yiming Zhou <uwyiming@google.com>
Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589310}