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This DCHECK was caused because the Embedded Assistant UI tried to grab
the focus while it was being closed.

This |RequestFocus| call was added explicitly to fix a bug where the
input text field in the Assistant UI would lose focus when submitting
a query while in tablet mode.

And this was happening because we tried to dismiss the virtual on-screen
keyboard.

I added unittests to test for these 3 scenarios, and I fixed it by dismissing
the virtual keyboard using a |HideKeyboard| method instead of dismissing it
by dropping the focus of the text field.

Bug: b/141945964
Change-Id: I3aca9e08ab0e2b7419cfe53c1f4dc831130cd0df
Tests: Added unittests and verified manually
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1848796
Commit-Queue: Jeroen Dhollander <jeroendh@google.com>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707983}