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When the tab switch button was "focused", the tab key wasn't working
because the routine involved was returning true, saying that it had
handled the tab key. This CL changes that.

Arrow keys still need to return true in this case, so
'AtEndWithTabSwitch()' was broken up into 'BidirAtEnd()' and
'SelectedSuggestionHasTabSwitch()' so that the tab key can
ignore the first condition, while arrow keys consider it.

Bug: 936851
Change-Id: I84b8b2e41f2601c978d31405b727eb60ea3c78c0
Reviewed-on: https://chromium-review.googlesource.com/c/1495198
Commit-Queue: Kevin Bailey <krb@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636939}