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This change implements logging of features that are shared by all quick
settings logging functions.

- Audio feature was previously only logged for a volume change,  but has
been moved to become a shared feature.
- There is also some reordering of the header file for readability
reasons.

Bug: 1014839
Change-Id: I4fc6cc9dc4d76acae5450894ec49258320b02d24
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087300Reviewed-by: Jia Meng <jiameng@chromium.org>
Commit-Queue: Rachel Wong <wrong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748073}