[Bug 23143] New: Add an "adopt" hook for Promises

https://www.w3.org/Bugs/Public/show_bug.cgi?id=23143

            Bug ID: 23143
           Summary: Add an "adopt" hook for Promises
    Classification: Unclassified
           Product: WebAppsWG
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DOM
          Assignee: [email protected]
          Reporter: [email protected]
        QA Contact: [email protected]
                CC: [email protected], [email protected]

The Promises spec currently has API hooks for fulfilling and rejecting a
promise.  It should also have a hook for adopting a promise.

Use-case: I'm returning a promise from an operation in the Font Load Events
API.  Sometimes it'll be rejected quickly and directly, so I need to have a
handle for the promise itself.  If all goes well, though, the result should be
as if Promise.every() was called on a spec-defined list of other promises,
which requires me to have the original returned promise adopt the result of the
Promise.every() algorithm (once it's defined in a spec fashion that can be
safely invoked).

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