Using goog.asserts will work with the compiler. So rather than
simply casting a nullable value when passing to a method, we can use
an assert which will correct the type and print a log if it somehow
is null.
This is not the same goog.asserts found in closure library, this
simply calls console.assert, but it is not required to do anything
for the compiler help.
Change-Id: I2548e39e772f0aa7ec41437cf9f5a2be383e0fbd
Sandra Lokshina
Jacob Trimble
Joey Parrish