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chongz authored
It is possible to have |GestureScrollUpdate| and |GesturePinchUpdate| in the same |GestureScrollBegin/End| sequence. This CL coalesces multiple GSUs and GPUs into 1 GSU and 1 GPU using matrix transformation. e.g. |GSB| -> |GSU| -> |GSU| -> |GPU| -> |GSU| -> |GSE| becomes |GSB| -> |GSU|* -> |GPU|* -> |GSE| * means coalesced events. Note that we have to go through the matrix when there are 2 adjacent pinch events with different pinch point as they would coalesce to 1 scroll event and 1 pinch event. BUG=661601 Review-Url: https://codereview.chromium.org/2552853002 Cr-Commit-Position: refs/heads/master@{#438534}
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