Can not test Timer with processing time domain
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Description
I have a stateful DoFn which has a timer on PROCESSING_TIME domain. While writing tests, I noticed that it does not react to `advanceProcessingTime()` on tests stream. Problem seems to be here:
[https://github.com/apache/beam/blob/master/runners/core-java/src/main/java/org/apache/beam/runners/core/SimpleDoFnRunner.java#L260](https://github.com/apache/beam/blob/master/runners/core-java/src/main/java/org/apache/beam/runners/core/SimpleDoFnRunner.java#L260)
I can only tell that patching this place works for direct runner tests. Not sure about broader impact on other runners since it is in `runner-core`
Imported from Jira [BEAM-5265](https://issues.apache.org/jira/browse/BEAM-5265). Original Jira may contain additional context.
Reported by: JozoVilcek.
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