static/frontend: add Escape key functionality to close tooltip

[essjay05]

frontend: adds escape key action to close tooltip

Updates ToolTipController to have Escape key functionality
to close tooltip. Tested successfully.

Screencast: https://screencast.googleplex.com/cast/NjA0MjM5NjE3NjQxNjc2OHwwYmI3ZGMyZC1jZQ

Fixes internal bug where Escape key needs to close tooltips/dialogs b/283533035

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This PR is being closed because golang.org/cl/633804 has been merged.