Switch to using the Skia vended Minikin alternative.

[chinmaygarde]

libTXT uses a forked version of Minikin for text shaping. Skia has a drop in replacement for this that passes all unit-tests in the txt_unittests target. This replacement should be added behind a runtime flag to test viability as a replacement for Minikin.

A benchmark harness for libTXT is also available and the same benchmarks can be run using the Minikin replacement to check performance.

We have previously used similar runtime flags when we initially switched away from the Blink based text shaping library to libTXT.

[chinmaygarde]

cc @jason-simmons @GaryQian

[chinmaygarde]

cc @drWulf and @Rusino

[GaryQian]

This is done via --enable-skshaper gn flag

[chinmaygarde]

Let's wait on closing this issue till the feature is not gated behind a flag.

[GaryQian]

Let's continue to track this in #39420 which is more of a general effort to complete the switch.

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.