Add a TODO to catch HTTP handler panics.
Add a TODO to catch HTTP handler panics.

Change-Id: I31fc3b7c9a935f7f5c6595fd3ee1c2081e137e39

fuchsia-mirror/third_party-github.com-golang-appengine,skyeunknown084/appengine,skyeunknown084/appengine,mzimmerman/appengine,golang/appengine,mzimmerman/appengine,mzimmerman/appengine,flowlo/appengine,fuchsia-mirror/third_party-github.com-golang-appengine,flowlo/appengine,skyeunknown084/appengine,flowlo/appengine,golang/appengine