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    Add a stack of queues of elements with reaction queues. · e1a83859
    dominicc authored
    The ordering of custom element 'reactions' (various kinds of
    callbacks) is determined by a stack which is pushed and popped within
    the scope of an operation. The stack entry is a queue of involved
    elements; this is so callbacks occur in order. However each element
    gets callbacks in an internally consistent chronological order. To
    effect this, each element has an associated reaction queue.
    
    BUG=594918
    
    Review-Url: https://codereview.chromium.org/2027513002
    Cr-Commit-Position: refs/heads/master@{#396806}
    e1a83859