Tests asynchronous call stacks for MutationObserver.

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Captured call stacks in no particular order:
Call stack:
    0) mutationCallback (async-callstack-mutation-observer.html:21)
    [Mutation]
    0) doMutations1 (async-callstack-mutation-observer.html:50)
    1) timeout1 (async-callstack-mutation-observer.html:44)
    [setTimeout]
    0) testFunction (async-callstack-mutation-observer.html:35)

Call stack:
    0) mutationCallback (async-callstack-mutation-observer.html:21)
    [Mutation]
    0) doMutations2 (async-callstack-mutation-observer.html:64)
    1) timeout2 (async-callstack-mutation-observer.html:57)
    [setTimeout]
    0) timeout1 (async-callstack-mutation-observer.html:43)
    [setTimeout]
    0) testFunction (async-callstack-mutation-observer.html:35)

Call stack:
    0) nestedMutationCallback (async-callstack-mutation-observer.html:28)
    [Mutation]
    0) doMutations1 (async-callstack-mutation-observer.html:50)
    1) mutationCallback (async-callstack-mutation-observer.html:20)
    [Mutation]
    0) doMutations1 (async-callstack-mutation-observer.html:50)
    1) timeout1 (async-callstack-mutation-observer.html:44)
    [setTimeout]
    0) testFunction (async-callstack-mutation-observer.html:35)

Call stack:
    0) nestedMutationCallback (async-callstack-mutation-observer.html:28)
    [Mutation]
    0) doMutations2 (async-callstack-mutation-observer.html:64)
    1) timeoutFromNestedMutation (async-callstack-mutation-observer.html:76)
    [setTimeout]
    0) nestedMutationCallback (async-callstack-mutation-observer.html:30)
    [Mutation]
    0) doMutations1 (async-callstack-mutation-observer.html:50)
    1) mutationCallback (async-callstack-mutation-observer.html:20)
    [Mutation]
    0) doMutations1 (async-callstack-mutation-observer.html:50)
    1) timeout1 (async-callstack-mutation-observer.html:44)

Call stack:
    0) timeoutFromMutation (async-callstack-mutation-observer.html:70)
    [setTimeout]
    0) mutationCallback (async-callstack-mutation-observer.html:23)
    [Mutation]
    0) doMutations1 (async-callstack-mutation-observer.html:50)
    1) timeout1 (async-callstack-mutation-observer.html:44)
    [setTimeout]
    0) testFunction (async-callstack-mutation-observer.html:35)

Call stack:
    0) timeoutFromNestedMutation (async-callstack-mutation-observer.html:75)
    [setTimeout]
    0) nestedMutationCallback (async-callstack-mutation-observer.html:30)
    [Mutation]
    0) doMutations1 (async-callstack-mutation-observer.html:50)
    1) mutationCallback (async-callstack-mutation-observer.html:20)
    [Mutation]
    0) doMutations1 (async-callstack-mutation-observer.html:50)
    1) timeout1 (async-callstack-mutation-observer.html:44)
    [setTimeout]
    0) testFunction (async-callstack-mutation-observer.html:35)

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