tree a715cab417f104c4aa5f7bef42a957eed9c0b619
parent 4564a4321532a96204771c8215c215a3bc5f369b
author Bert Muthalaly <stijlist@google.com> 1563923860 -0400
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> 1565631069 +0000

[fidl/bindings] add BindingSet#Size

...enabling callers to know how many clients a given service has without
making a copy via BindingSet#BindingKeys.

NET-2429 #progress

Change-Id: I17cefff36b3bf98bb86691b9f051da6b171cdc47