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When a query is kicked off by tiles, user could modify it multiple
times, before hitting the enter button or clicking on a suggestion
to finish the query.
This CL adds a field in OmniboxLog to indicate whether the query
is kicked off by a tile. So that the field can be passed to
OmniboxEvent proto later on. To do this, whenever the omnibox is focused
or autocompletion flow starts, a flag is turned on to check whether
the focus or the flow is caused by query tiles. And the flag is later
passed  to OmniboxLog when a suggestion is selected.

BUG=1090911

Change-Id: If0d9eab92b3073e7d209359efc20544aa9691a0b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2229882Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Ender <ender@google.com>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#776874}