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To reduce the ChromeVox interaction in Assistant listening mode,
This patch:
1. Does not focus on the Mic button when showing the voice input UI.
2. Fixes a bug that shows keyboard input UI first and then switch to
   voice input UI.

Bug: b/167501035
Test: Updated tests
Change-Id: I6bdc83a114f4a8a6ebeb691ec0d784ec5696cf44
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532929
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828389}