[Webkit-unassigned] [Bug 200009] New: Correct web audio-related crash in seed reports

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=200009

            Bug ID: 200009
           Summary: Correct web audio-related crash in seed reports
           Product: WebKit
           Version: Safari 10
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org

We removed access to the Audio Processing Tap XPC service in our iOS 13 work because our testing did not show it being used in normal browsing tests. Unfortunately, it is used in some web audio cases (and games).

This patch makes two changes:

(1) It restores access to the "com.apple.coremedia.audioprocessingtap.xpc" XPC service.
(2) It checks the return value of MTAudioProcessingTapCreate (which fails when the service is blocked) and returns early to avoid using the invalid audio tap.

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