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The Lenovo Horizon device displays the wrong number of the touch pointers when all fingers released from the screen. Because HWND Message sometimes sends inconsistent number of touch pointers, we keep the IDs of touch pointers we have seen from last time, and release the ones which are not in the current message.

BUG=316085

Review URL: https://codereview.chromium.org/988473002

Cr-Commit-Position: refs/heads/master@{#329770}