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Currently, we trigger on-focus suggestions (ZeroSuggest) when the
omnibox receives focus.

But what about the case where the omnibox starts with focus, like the
NTP? In the status quo, the user would have to blur and then re-focus
the omnibox.

This CL allows users to get on-focus suggestions by clicking or tapping
the omnibox while already focused, assuming the textfield is empty.
We restrict it to empty textfield because:

 1) The only known use-case is the NTP so far.

 2) We want to be conservative and not disrupt any user text selection
    or editing.

Bug: 1010368, 996516
Change-Id: I2681c297c1372a5421f742bd0f18657f3c8603ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863589
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: manuk hovanesian <manukh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706185}