class BindSharedCollection

Convert a [`fuchsia.sysmem2/BufferCollectionToken`] into a

[`fuchsia.sysmem2/BufferCollection`].

At the time of sending this message, the buffer collection hasn't yet

been populated with buffers - the participant must first also send

[`fuchsia.sysmem2/BufferCollection.SetConstraints`] via the

`BufferCollection` client end.

All `BufferCollectionToken`(s) duplicated from a root

`BufferCollectionToken` (created via `AllocateSharedCollection`) must be

"turned in" via `BindSharedCollection` (or `Release`ed), and all

existing `BufferCollection` client ends must have sent `SetConstraints`

before the logical BufferCollection will be populated with buffers (or

will fail if the overall set of constraints can't be satisfied).

+ request `token` The client endpoint of a channel whose server end was

sent to sysmem using

[`fuchsia.sysmem2/Allocator.AllocateSharedCollection`] or whose server

end was sent to sysmem using

[`fuchsia.sysmem2/BufferCollectionToken.Duplicate`]. The token is

being "turned in" in exchange for a

[`fuchsia.sysmem2/BufferCollection`].

+ request `buffer_collection_request` The server end of a

[`fuchsia.sysmem2/BufferCollection`] channel. The sender retains the

client end. The `BufferCollection` channel is a single participant's

connection to the logical buffer collection. Typically there will be

other participants with their own `BufferCollection` channel to the

logical buffer collection.