This is a reland of commit 84c48ae7513bad9c9ca19271569cd0431e780c32
Original change's description:
> [Stats] Move metric names to Attribute, constructed via AttributeInit.
>
> As of this CL, Attribute no longer implements RTCStatsMemberInterface
> and a member no longer owns knowing its own name. The attribute knows
> the name because we pass it down at construction time.
>
> To achieve this, the WEBRTC_RTCSTATS_IMPL() macro is updated to take
> AttributeInits instead of raw member pointers, i.e. (name, ptr) pairs.
>
> By constructing RTCStatsMember<T> without a name parameter, it does the
> same thing as the absl::optional<T> constructor. So RTCStatsMember<T>'s
> days are numbered!
>
> Bug: webrtc:15164
> Change-Id: I560c0134bae1c2d7218426a1576425ecc1b677a7
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/334203
> Commit-Queue: Henrik Boström <hbos@webrtc.org>
> Reviewed-by: Evan Shrubsole <eshr@google.com>
> Cr-Commit-Position: refs/heads/main@{#41540}
Bug: webrtc:15164
Change-Id: I28f3d588004ff185e5820347ad9513f2f7a6cc66
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/335020
Auto-Submit: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Henrik Boström <hbos@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#41556}
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