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[Chromedriver] Add ability to merge capabilities to make chromedriver closer to being w3c compliant.

This is built on yash's previous work.
w3c standard: https://w3c.github.io/webdriver/webdriver-spec.html#processing-capabilities

Change-Id: I9b2f49c0f2ebff59fd5b053c2d8b9b99a95aabe5

BUG=chromedriver:1740

Change-Id: I9b2f49c0f2ebff59fd5b053c2d8b9b99a95aabe5
Reviewed-on: https://chromium-review.googlesource.com/562377Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Jonathon Kereliuk <kereliuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488663}