[ChromeDriver] Get and Set Window Rect updates on the status page

Previously incomplete, now complete :)

Bug: 
Change-Id: Ia2a1fa584baf27b90d245c60501dfd074a18ac08
Reviewed-on: https://chromium-review.googlesource.com/736390
Reviewed-by: Shuotao Gao <stgao@chromium.org>
Commit-Queue: Jonathon Kereliuk <kereliuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515957}
1 file changed