Prevent sending PEs to dummy targets.
Prevent sending PEs to dummy targets.

There are some dummy targets in the touch lists that are kept for TE
targetTouches list only. For PE, these targets are meaningless.

BUG=

Review URL: https://codereview.chromium.org/1221503002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@198242 bbb929c8-8fbe-4397-9dbb-9b2b20218538

Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk