add epsilon to scrubber seek
add epsilon to scrubber seek

Change-Id: I823f5c3ab302558ec577f1ec3c5a09e8ec6ade6a
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/453942
Reviewed-by: Florin Malita <a8262bf13ea8c26821e91ea9bca6740a77c96dcd@google.com>
Commit-Queue: Jorge Betancourt <63f45fa27f6ebe96d0924e755262c906d4cb18db@google.com>
Auto-Submit: Jorge Betancourt <63f45fa27f6ebe96d0924e755262c906d4cb18db@google.com>

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