[webkit-dev] debug-test-runner: Timed out waiting for notifyDone to be called

[Benjamin King]

Hi, 

I’m trying to run a LayoutTest case in the debugger using `debug-test-runner` and it fails by timing out, see below. However, if I run `run-webkit-test` it works. I read the WebKit wiki on debugging and searched google to no avail. Any advice?

```
% ./Tools/Scripts/debug-test-runner LayoutTests/webaudio/biquad-lowpass.html
…
(lldb) run
…
2020-08-13 12:30:12.960868-0400 WebKitTestRunner[73700:1010133] [Loading] 0x10a026020 - [pageProxyID=7, webPageID=8, PID=73704] WebPageProxy::didCommitLoadForFrame: frameID = 3
Content-Type: text/plain
#PID UNRESPONSIVE - WebKitTestRunner (pid 73700)
FAIL: Timed out waiting for notifyDone to be called

#EOF
#EOF
#EOF
…
Process 73700 exited with status = 0 (0x00000000)
```

```
% ./Tools/Scripts/run-webkit-tests LayoutTests/webaudio/biquad-lowpass.html
…
Running 1 test

Starting helper ...2020-08-13 12:27:48.457 LayoutTestHelper[73637:1007760] Could not determine current color profile, so it will not be reset after running the tests.
Running 1 WebKitTestRunner.     

The test ran as expected.   
```
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