Use the common ScaleGestureDetector to detect the multi-touch motion. Check both supportZoom and getBuiltInZoomControls to decide whether enable the multi-touch behavior. This should the new pinch behavior only replace the old +/-. Fix http://b/issue?id=2363260 Only update textWrapScale if it is different. This should fix the performance decrease caused by initial multi-touch code. Fix http://b/issue?id=2371694
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