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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}
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