[ChromeDriver] Minimize window implementation

This is an implementation of the minimize window endpoint
It uses the Browser.setWindowBounds protocol method

spec: https://w3c.github.io/webdriver/webdriver-spec.html#minimize-window

Bug: chromedriver:1940
Change-Id: If5e3394b02f107a254d6be8d8b94a1a7f23b97c7
Reviewed-on: https://chromium-review.googlesource.com/964734
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Jonathon Kereliuk <kereliuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543615}
8 files changed