[Webkit-unassigned] [Bug 152819] New: Add Promise benchmark to JetStream

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=152819

            Bug ID: 152819
           Summary: Add Promise benchmark to JetStream
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jdanyow at gmail.com

Modern JavaScript APIs are growing more and more Promise heavy.  It would be awesome if the benchmark suite was enhanced to cover Promise performance.

One option would be to add a dedicated Promise benchmark.  Alternatively the pdfjs bench could be updated to use the javascript engine's built-in Promise when available.

Some links:
* [Corresponding issue for Octane benchmark](https://github.com/chromium/octane/issues/35)
* [Bluebird Promise benchmarks](https://github.com/petkaantonov/bluebird/tree/master/benchmark)
* [jsFiddle demonstrating Promise perf issues in Microsoft Edge](https://jsfiddle.net/jdanyow/vj6o119n/)
* [Microsoft Edge user voice issue](https://wpdev.uservoice.com/forums/257854-microsoft-edge-developer/suggestions/11329845-improve-promise-implementation-performance)

Let me know what you think- I'm willing to work on a PR if you want to provide some direction on this.

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