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When a readback cannot be returned because the tab is no longer attached
to the view, all the subsequent readback would be abandoned, causing
blank or stale thumbnails in Grid Tab Switcher. When this happens, the
symptom persists until the tab is reattached to the view or a restart.

This symptom caused StartSurfaceLayoutTest to be flaky. This CL tries to
reduce the flakiness by reattaching the Tab to the view by switching to
it.

Bug: 989348
Change-Id: Ia714ac8f674b5194e91a56cf19b2b9e4ece8b55f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1727520Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683244}