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Also adds helpers for isCompactHeight and isSplitToolbarMode in
ChromeEarlGreyImpl.

Bug: 987646
Change-Id: Id8f48a0e126faab215ffb6ed8d2e306b13f33bbe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864355
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Auto-Submit: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707040}