Be sure lookupMenu input is focused before showing

Resolving this bug reveals a completely unrelated bug where hitting
enter while making a link prior to the input being focused, the
selected text gets replaced with a new line.

Bug: 51075
Bug: 49941
Change-Id: I61a90eeaa40b8b66886c17152544c46fa8ca396a
Merge "Be sure lookupMenu input is focused before showing"