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The present CL modifies GetGridBoundsInScreenForSplitview so that it
uses the correct split view controller when on an external display.

SplitViewOverviewSessionInClamshellTestMultiDisplayOnly.Dragging

Test: ash_unittests
Bug: 1019221
Change-Id: Ibba4867a342d6a4057e7bb724fbd24b0dae85d77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1887837
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710575}