Trigger a full screen repaint when touching layers, as webkitDraw()
may not generate the correct invalidations.

counterpart java CL: https://android-git.corp.google.com/g/#/c/140427/

bug:5425608 bug:5218173
Change-Id: I4a958a6fac4054a1040cb077cdfa2aff076e3fad
1 file changed