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caption bubble.

If 5 seconds pass with no activity, hide the caption bubble. Activity
is defined as one of the following occurring:
- Transcription received from the speech service
- User interaction, such as clicking a button or focusing the bubble

More refinements to this will occur in a follow-up, such as clearing the
caption text.

Bug: 1055150
Change-Id: I33c96c09bc89bbfe68b1c8899f3aa5289ed44f76
AX-Relnotes: N/A (feature has not launched)
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518129Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Cr-Commit-Position: refs/heads/master@{#824586}