[Chromedriver] ExecutePerformActions method WIP

implementing actions API
Most of the logic for processing and dispatching is done helper methods
which will be submitted when this lands

Change-Id: I366f2db206de53ac92b3cece58f220f9b6148ba9

BUG=https://bugs.chromium.org/p/chromedriver/issues/detail?id=1897

Change-Id: I366f2db206de53ac92b3cece58f220f9b6148ba9
Reviewed-on: https://chromium-review.googlesource.com/582067
Commit-Queue: Jonathon Kereliuk <kereliuk@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#489386}
2 files changed