What does 赤い丸 look like on Google?

On Google it is the design shipped in 17.0, shown above at full size. Older revisions are listed beneath it.

When did Google add 赤い丸?

Google first drew 赤い丸 in Android 4.3, released 2013年7月24日.

Google LLC has shipped 21 versions of 赤い丸. Each is dated, so you can see when the design changed.

Google Android 10.0 March 2020 Feature Drop

This is the design Google introduced in Android 8.0, shipped again unchanged. It was not redrawn for this release.

✳ marks a release that redrew this emoji. The rest re-shipped the design unchanged.

What does 赤い丸 look like on Google?: On Google it is the design shipped in 17.0, shown above at full size. Older revisions are listed beneath it.
When did Google add 赤い丸?: Google first drew 赤い丸 in Android 4.3, released 2013年7月24日.
How many times has Google redrawn 赤い丸?: Google LLC has shipped 21 versions of 赤い丸. Each is dated, so you can see when the design changed.