This is a reland of commit c21f7c847c,
BUT the `setExceptionPauseMode` procedure is no longer deleted in this
commit. We are not ready to delete that procedure yet, because deleting
it breaks IDE support: https://github.com/flutter/flutter/issues/117526.
TEST=CI
Original change's description:
> [3.0 alpha][VM/Service] Update VM Service spec to v4.0
>
> This CL updates the VM Service spec to version 4.0 in order to add
> support for records. Some deprecated procedures and properties will also
> be removed in v4.0.
>
> As described in service.md's changelog, this CL:
> Adds `Record` and `RecordType` `InstanceKind`s, adds a deprecation
> notice to the `decl` property of `BoundField`, adds `name` property to
> `BoundField`, adds a deprecation notice to the `parentListIndex`
> property of `InboundReference`, changes the type of the `parentField`
> property of `InboundReference` from `@Field` to `@Field|string|int`,
> adds a deprecation notice to the `parentListIndex` property of
> `RetainingObject`, changes the type of the `parentField` property of
> `RetainingObject` from `string` to `string|int`, removes the deprecated
> `setExceptionPauseMode` procedure, removes the deprecated `timeSpan`
> property from `CpuSamples`, and removes the deprecated `timeSpan`
> property from `CpuSamplesEvent.
>
> TEST=CI
>
> Issue: https://github.com/dart-lang/sdk/issues/49725
> Change-Id: I7bf61c1ba11a0c7fd95a10c9c02c14282062b802
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/268521
> Commit-Queue: Derek Xu <derekx@google.com>
> Reviewed-by: Ben Konyi <bkonyi@google.com>
Change-Id: Ieb96d426b622745e653afd6ca8c9718b1deae0a1
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/278160
Commit-Queue: Derek Xu <derekx@google.com>
Reviewed-by: Ben Konyi <bkonyi@google.com>
e738858aae