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tdresser authored
Previously we tried to refcount the tracking id to slot id mapping. This broke in some circumstances where the number of press events was not equal to the number of release events. This patch switches to marking some touch events such that they don't modify the mapping, simplifying logic, and fixing a nasty bug. BUG=439051 TEST=EventsXTest.TouchEventNotRemovingFromNativeMapping Review URL: https://codereview.chromium.org/785753002 Cr-Commit-Position: refs/heads/master@{#313520}
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