growth: Make action performer action optional. Making the growth action performer's action optional. The caller should still check if action is defined before calling this method. Record an error metric if action is not provided. Bug: b/355091624 Change-Id: I4b3e567367eaaeadd322c088653735e938850aea Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5736545 Reviewed-by: Li Lin <llin@chromium.org> Reviewed-by: Tao Wu <wutao@chromium.org> Commit-Queue: Thu Huong Vu <thv@chromium.org> Cr-Commit-Position: refs/heads/main@{#1335161}
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