Tests asynchronous call stacks for various DOM events.

Set timer for test function.
Captured call stacks in no particular order:
Call stack:
    0) onHashChange1 (async-callstack-events.js:63)
    [hashchange]
    0) doTestHashChange (async-callstack-events.js:57)
    1) testFunction (async-callstack-events.js:22)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>

Call stack:
    0) onHashChange2 (async-callstack-events.js:69)
    [hashchange]
    0) doTestHashChange (async-callstack-events.js:57)
    1) testFunction (async-callstack-events.js:22)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>

Call stack:
    0) onSelectionChange (async-callstack-events.js:50)
    [selectionchange]
    0) setSelection (async-callstack-events.js:35)
    1) doTestSelectionChange (async-callstack-events.js:42)
    2) testFunction (async-callstack-events.js:22)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>

Call stack:
    0) onVideoPlay (async-callstack-events.js:82)
    [play]
    0) doTestMediaEvents (async-callstack-events.js:76)
    1) testFunction (async-callstack-events.js:22)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>