Revert "Revert "Refactor Single key detector to provide start, c..."

Revert submission 33530799-revert-33464207-support_gemini_power_key_animation-OWWMRETITV

Reason for revert: Tested locally but the reported tests pass (falsely reverted): Will test on ABTD to confirm

Tests are failing with or without CLs: Some other issue.
Without CL: https://android-build.corp.google.com/builds/abtd/run/L46300030012099882
With CL: https://android-build.corp.google.com/builds/abtd/run/L46300030012098202

Reverted changes: /q/submissionid:33530799-revert-33464207-support_gemini_power_key_animation-OWWMRETITV

Change-Id: I6c1ad554fe4b2f2847be7ca1111b77e6141048e4