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:71)
    [async function]
    0) testFunctionTimeout (async-callstack-async-await2.js:54)
    [setTimeout]
    0) testFunction (async-callstack-async-await2.js:47)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>

Call stack:
    0) doTestChainedPromises (async-callstack-async-await2.js:73)
    [async function]
    0) testFunctionTimeout (async-callstack-async-await2.js:54)
    [setTimeout]
    0) testFunction (async-callstack-async-await2.js:47)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>

Call stack:
    0) doTestChainedPromises (async-callstack-async-await2.js:75)
    [async function]
    0) testFunctionTimeout (async-callstack-async-await2.js:54)
    [setTimeout]
    0) testFunction (async-callstack-async-await2.js:47)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>

Call stack:
    0) doTestChainedPromises (async-callstack-async-await2.js:77)
    [async function]
    0) testFunctionTimeout (async-callstack-async-await2.js:54)
    [setTimeout]
    0) testFunction (async-callstack-async-await2.js:47)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>

Call stack:
    0) thenCallback (async-callstack-async-await2.js:59)
    1) doTestChainedPromises (async-callstack-async-await2.js:78)
    [async function]
    0) testFunctionTimeout (async-callstack-async-await2.js:54)
    [setTimeout]
    0) testFunction (async-callstack-async-await2.js:47)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>

Call stack:
    0) thenCallback (async-callstack-async-await2.js:59)
    1) doTestChainedPromisesJSON (async-callstack-async-await2.js:90)
    [async function]
    0) testFunctionTimeout (async-callstack-async-await2.js:54)
    [setTimeout]
    0) testFunction (async-callstack-async-await2.js:47)
    [setTimeout]
    0) scheduleTestFunction <omitted>
    <... skipped remaining frames ...>