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[Chromedriver] set up endpoints for the action API

This is a WIP for implementing the actions API
I am planning to break up my CLs into logical small chunks and this is
the start

Change-Id: I94bd3b0b7cbd7a727bbb6bd7e02f52651fe8d1d8
Reviewed-on: https://chromium-review.googlesource.com/578475Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Jonathon Kereliuk <kereliuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488301}