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On Android, WebTouchPoint.state of all touches is set to "StateMoved" thus
included in changedTouches when any touch moves. This patch compares current
touch points position to previous position in TouchMove event and updates state.
This comparision is done after all filtering and potential coalescing
in TouchEventQueue.

BUG=416236

Review URL: https://codereview.chromium.org/788923002

Cr-Commit-Position: refs/heads/master@{#314315}