Tests asynchronous call stacks for async functions.

Set timer for test function.
Captured call stacks in no particular order:
Call stack:
    0) doTestChainedPromises (async-callstack-async-await2.js:73)
    [await]
    0) testFunctionTimeout (async-callstack-async-await2.js:56)
    [setTimeout]
    0) testFunction (async-callstack-async-await2.js:49)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>

Call stack:
    0) doTestChainedPromises (async-callstack-async-await2.js:75)
    [await]
    0) testFunctionTimeout (async-callstack-async-await2.js:56)
    [setTimeout]
    0) testFunction (async-callstack-async-await2.js:49)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>

Call stack:
    0) doTestChainedPromises (async-callstack-async-await2.js:77)
    [await]
    0) testFunctionTimeout (async-callstack-async-await2.js:56)
    [setTimeout]
    0) testFunction (async-callstack-async-await2.js:49)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>

Call stack:
    0) doTestChainedPromises (async-callstack-async-await2.js:79)
    [await]
    0) testFunctionTimeout (async-callstack-async-await2.js:56)
    [setTimeout]
    0) testFunction (async-callstack-async-await2.js:49)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>

Call stack:
    0) thenCallback (async-callstack-async-await2.js:61)
    1) doTestChainedPromises (async-callstack-async-await2.js:80)
    [await]
    0) testFunctionTimeout (async-callstack-async-await2.js:56)
    [setTimeout]
    0) testFunction (async-callstack-async-await2.js:49)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>

Call stack:
    0) thenCallback (async-callstack-async-await2.js:61)
    1) doTestChainedPromisesJSON (async-callstack-async-await2.js:92)
    [await]
    0) testFunctionTimeout (async-callstack-async-await2.js:56)
    [setTimeout]
    0) testFunction (async-callstack-async-await2.js:49)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>