Manual merge of https://android-git.corp.google.com/g/Gerrit#change,5804 from donut:
Ensure that we never trigger ArrayIndexOutOfBoundsException by checking that
the index is always < the array's length. Also ensures that the object's
state is consistent. Should resolve a denial-of-service bug when handling
malformed WAP pushes.
Also add a try-catch around call to dispatchMessage(), in case there are other lurking bugs. (This is also already in Donut.)
Automated import of CL 150264
2e7e15f2da